At 8 weeks pregnant you are about 2 months along in the first trimester, with about 32 weeks to go, and your baby is roughly half an inch long from crown to rump.
Week 8 is when pregnancy often starts to feel real: the nausea may be at its strongest, your first prenatal visit is likely on the calendar, and your baby is changing fast even though nothing shows on the outside yet.
This guide covers development, size, symptoms, the first visit, the screening tests that open soon, sleep, and the signs that mean you should call. Every clinical detail was read in October 2026 on the primary sources named in the text, and where they disagree, we print both.
Key Takeaways
8 weeks pregnant is about 2 months, or six weeks after conception (Mayo Clinic), with about 32 weeks to go.
Mayo Clinic lists about 1/2 inch (11 to 14 mm) crown to rump; Nemours KidsHealth compares it to a raspberry.
Cleveland Clinic says morning sickness is worst for most around 8 to 10 weeks; vomiting three or more times a day is a reason to call.
UPMC says the first prenatal visit usually happens around 8 weeks. MedlinePlus says cfDNA screening can start at 10 weeks.
Bleeding, severe or one-sided pelvic pain, shoulder pain, fainting or a fever of 100.4 F or higher need a call right away.
Table of Contents
8 Weeks Pregnant at a Glance
Quick Answer
At 8 weeks pregnant you are about 2 months along, in the first trimester, with about 32 weeks to go. Mayo Clinic lists the embryo at about 1/2 inch (11 to 14 mm) crown to rump, and Nemours KidsHealth compares it to a raspberry. UPMC says the first prenatal visit usually happens around now.
8 weeks pregnant
What to know
Trimester
First. UPMC, using the American College of Obstetricians and Gynecologists (ACOG) definition, says the second trimester begins at 14 weeks 0 days; Mayo Clinic calls the first 12 weeks the first trimester.
Month
About 2 months, counting 4 weeks and a few days per month. Months are a convention, not a medical unit.
Weeks to go
About 32 (40 minus 8, counted from the last menstrual period).
Baby’s size
About 1/2 inch (11 to 14 mm) crown to rump (Mayo Clinic); about the size of a raspberry (Nemours KidsHealth).
Common symptoms
Nausea, tiredness, sore breasts, peeing more often, mild period-like cramps.
This week’s care focus
Your first prenatal visit, which UPMC says usually happens around 8 weeks.
8 weeks pregnant: quick facts with sources.
How the weeks are counted. Pregnancy weeks start on the first day of your last menstrual period (LMP), not on the day you conceived. Mayo Clinic says conception typically happens about two weeks after the last period begins, which is why it calls week 8 “six weeks after conception.” An early ultrasound helps estimate your due date (MedlinePlus), so your provider may adjust your week count.
8 weeks pregnant in months. About two months. Cleveland Clinic’s guide, which uses four-week months, puts weeks 5 through 8 in month 2, so this is the last week of your second month.
Your Baby’s Development at 8 Weeks
No source can say what your own baby is doing on a given day. These are the changes the references date to week 8.
Source and timing
What it says is happening
Mayo Clinic, week 8
Leg buds take a paddle shape and fingers begin to form. Swellings that will shape the outer ears appear, the eyes become noticeable, the upper lip and nose have formed, and the trunk and neck begin to straighten.
Cleveland Clinic, week 8
All of the major organs and body systems are developing. The hands and feet are web-like.
Nemours KidsHealth, week 8
The head is large compared with the body, the arms may start to move, and the retina has begun to develop pigment. The heart, lungs, brain and kidneys continue to develop.
Development around 8 weeks, by source.
Embryo or fetus? Sources differ. Cleveland Clinic says providers call the embryo a fetus after the 8th week, and elsewhere on the same page says around the ninth week. UPMC says it is not technically a fetus until week 10, and Mayo Clinic’s guide starts using the word at week 11. The label changes; development is continuous.
Heartbeat. Cleveland Clinic says a provider can probably detect the early heart’s pulses on a vaginal ultrasound in week 6. MedlinePlus says the heartbeat usually cannot be heard or seen on ultrasound until at least 6 to 7 weeks. Timing varies, so talk any scan result through with your provider.
Movement and sex. You will not feel movement yet: Cleveland Clinic says most people feel the fetus moving by the end of the fifth month. KidsHealth says the genitals are not developed enough at 8 weeks to show the sex. MedlinePlus says cfDNA screening can sometimes be used to determine sex.
How Big Is Your Baby at 8 Weeks?
Source
Timing
Length
Weight or comparison
Mayo Clinic
Week 8
About 1/2 inch (11 to 14 mm), crown to rump
Not given
Nemours KidsHealth
Week 8
Just a bit longer than half an inch
About .04 of an ounce; “about the size of a raspberry”
Cleveland Clinic
End of month 2
About 0.5 to 1 inch
“About the size of a black bean”
Baby size at 8 weeks. Sources differ, so each is printed.
Mayo Clinic measures crown to rump, from the top of the head to the bottom of the tailbone, so the legs are not included. The other two do not state a method. These are averages; the measurement your provider takes is the one that counts for you.
An 8 week ultrasound. Not everyone has one. UPMC says there is usually no ultrasound at the first visit unless your dates are uncertain or you have bleeding or cramping, and that early scans are transvaginal. MedlinePlus says you should have a first trimester ultrasound to estimate your due date.
8 Weeks Pregnant Symptoms
UPMC says weeks 8 or 9 are often the hardest, with tiredness and queasiness. Cleveland Clinic says morning sickness feels worst for most women around 8 to 10 weeks.
Symptom
What the sources say
What may help
Nausea
About 70% of women get morning sickness; it tends to improve around the 13th week (Cleveland Clinic).
Crackers or toast in the morning, bland foods, steady sips of fluid, ginger tea (Cleveland Clinic). Smaller, more frequent meals (UPMC).
Tiredness
A common first trimester symptom (UPMC).
An afternoon nap and short walks (UPMC).
Sore breasts
Sore breasts and nipple changes are common (UPMC).
A comfortable, supportive bra.
Peeing more often
Listed at week 8 by KidsHealth.
Limit caffeine, but not water (UPMC).
Cramps
KidsHealth lists cramps that feel like period pain.
Mention them at your visit; cramping with bleeding needs a call.
Constipation
Listed by UPMC.
More water and fiber (UPMC).
Common symptoms at 8 weeks pregnant.
When nausea is more than morning sickness. Cleveland Clinic describes hyperemesis gravidarum as nausea lasting several hours a day with vomiting more than four times a day, severe dehydration and losing 10 pounds or more; some people need IV fluids. It says to call your provider if you vomit three or more times a day, if nausea lasts all day and stops you from eating or drinking, or if you have dizziness, fainting, a racing heartbeat or very little urine. Treatment exists, so do not wait it out. Few symptoms? Not everyone gets morning sickness (Cleveland Clinic puts it at about 70% of women), but call if a change worries you.
Spotting and cramping. UPMC says bleeding or cramping can signal a miscarriage or an ectopic pregnancy, so report them. Mayo Clinic says the first warning signs of an ectopic pregnancy are often light vaginal bleeding and pelvic pain. Our guide to implantation bleeding explains the earliest kind of spotting.
Baby on the way? Get ahead on sleep.
Our free two-minute quiz builds a gentle, personalized sleep plan you can use from the first weeks at home.
8 weeks pregnant belly. When you start showing varies, and no source we read gives a week for it. KidsHealth says clothes may feel tight because your uterus is swelling. See pregnant belly by month, and our hCG levels guide for the hormone behind your positive test.
Sharing the news. When to tell people is your call, not a medical rule. When you are ready, browse our pregnancy announcement ideas.
Prenatal Care, Tests and Appointments Around Week 8
UPMC says the first prenatal visit usually happens around 8 weeks and lasts about 45 minutes. MedlinePlus says visits are usually monthly in the first trimester.
What usually happens
Details
Source
Health history
Past pregnancies, medicines and supplements, alcohol and drug use, family health and genetic history
MedlinePlus
Exam
Blood pressure, height and weight, pelvic exam with a Pap smear and STI swabs
UPMC
Blood and urine tests
Blood count, blood type and Rh, rubella immunity, hepatitis, syphilis, HIV, cystic fibrosis carrier screen, urinalysis
MedlinePlus
Due date
Confirming the pregnancy and estimating the due date
KidsHealth
What the first prenatal visit usually includes.
Bring to the visit: the date your last period started, a list of every medicine and supplement you take, any family health history you can gather, and your questions written down, because nausea and tiredness make it easy to forget.
Genetic screening. MedlinePlus says it is offered to all women; UPMC notes you can decline. The windows open soon:
Test
Timing
Source
Cell free DNA (cfDNA) screening, a blood test for trisomy 21, 18 and 13; a positive result needs confirming tests
As early as the 10th week
MedlinePlus
First trimester screen, a blood test plus an ultrasound of fluid at the back of the neck
Around weeks 11 to 13
UPMC
Genetic screening windows after week 8.
Screening tells you about chance, not certainty. MedlinePlus says a genetic counselor can help you understand your risks and results.
What to Do This Week: A Simple Checklist
Book your first visit: if it is not on the calendar yet.
Keep taking a prenatal vitamin: UPMC advises one daily with folic acid.
List your medicines: MedlinePlus says to take none without asking your provider.
Eat small and often: and sip fluids all day.
Decide about screening: so you can ask about timing at your visit.
Save your call list: keep your provider’s daytime and after-hours numbers in your phone.
Move gently: UPMC says light to moderate exercise is generally safe; ask what fits you.
Sleep at 8 Weeks Pregnant
MedlinePlus says you may sleep well in the first trimester but may need more sleep, and suggests short naps to make up for lost sleep at night. If you are crashing early in the evening, an earlier bedtime is a reasonable response, and a few plain crackers on the nightstand can help if nausea wakes you.
Position. No source here sets a rule for week 8. MedlinePlus’s general pregnancy advice: lying on your side with knees bent is likely most comfortable, and many providers recommend the left side. Ask your provider.
Evenings: limit soda, coffee and tea, and skip exercise right before bed (MedlinePlus).
MedlinePlus says not to take sleep aids, including herbal products, without your provider. See melatonin during pregnancy.
For Partners: How to Help at 8 Weeks
Go to the first visit: MedlinePlus says a partner may attend.
Take over strong smells: like cooking and trash.
Protect rest: pick up a chore so there is room for a nap, and learn the warning signs below.
Looking Ahead: What Comes Next
Week 9: Mayo Clinic says the arms grow, elbows appear, toes are visible and eyelids form, at a little less than 3/4 inch (16 to 18 mm) crown to rump. Cleveland Clinic says the beginnings of teeth and taste buds are forming.
Week 10: Mayo Clinic says the elbows can bend and fingers and toes lose their webbing. UPMC says the fetus is about one inch, and MedlinePlus says cfDNA screening can start.
Week 13: Cleveland Clinic says morning sickness tends to improve.
UPMC lists these first trimester warning signs: severe nausea and vomiting, vaginal bleeding or spotting, cramping, green, yellow or foul-smelling discharge, pain when urinating, and a fever above 100.4 F.
Ectopic pregnancy. Mayo Clinic says the first warning signs are often light bleeding and pelvic pain, and advises urgent medical help for severe abdominal or pelvic pain with bleeding, extreme lightheadedness or fainting, or shoulder pain.
Seek medical care immediately for the CDC’s urgent maternal warning signs, including:
A headache that will not go away, dizziness or fainting, or vision changes.
Trouble breathing, chest pain or a fast-beating heart.
Severe belly pain that does not go away, or vaginal bleeding.
Thoughts about harming yourself or your baby.
If you cannot reach your provider, go to the emergency room or call 911 and say you are pregnant. This article is education, not medical advice.
Frequently Asked Questions
How many months is 8 weeks pregnant?
About 2 months. Counting 4 weeks and a few days per month, 8 weeks is right around the two month mark, and Cleveland Clinic’s month-by-month guide puts weeks 5 through 8 in month 2. Providers track pregnancy in weeks, counted from the first day of your last period, so months are only a rough guide.
How big is my baby at 8 weeks pregnant?
Mayo Clinic lists about 1/2 inch, or 11 to 14 millimeters, measured from crown to rump. Nemours KidsHealth says the baby is about the size of a raspberry, just a bit longer than half an inch, and weighs about .04 of an ounce. These are averages, and healthy babies vary.
Is it an embryo or a fetus at 8 weeks?
Sources differ. Cleveland Clinic says providers call the embryo a fetus after the 8th week, and elsewhere says around the ninth week. UPMC says it is not technically a fetus until week 10, and Mayo Clinic’s guide starts using the word at week 11. The development itself is continuous.
Can you see the heartbeat on an ultrasound at 8 weeks?
Often, but timing varies. MedlinePlus says the heartbeat usually cannot be heard or seen on ultrasound until at least 6 to 7 weeks, and Cleveland Clinic says a vaginal ultrasound can probably detect the early heart’s pulses in week 6. Not everyone has a scan at 8 weeks, so talk any result through with your provider.
Is morning sickness worse at 8 weeks?
For many people, yes. Cleveland Clinic says morning sickness feels worst for most women around 8 to 10 weeks and tends to improve around the 13th week. UPMC says weeks 8 or 9 are often the hardest. Call your provider if you vomit three or more times a day or cannot keep fluids down.
What happens at the first prenatal appointment?
UPMC says it usually happens around 8 weeks and lasts about 45 minutes. Expect a health history, blood pressure, height and weight, a pelvic exam with a Pap smear, blood tests such as blood type, Rh and rubella immunity, urine tests, and a due date estimate, according to UPMC and MedlinePlus.
Calmer days, better nights.
Betteroo builds a personalized sleep plan for your baby. Take the free two-minute quiz and have it ready before the newborn weeks.
