At 8 weeks pregnant, your baby is about the size of a raspberry and every major organ system is already taking shape. Your body, meanwhile, is working overtime behind the scenes, even though you likely aren’t showing yet. This is one of the most active weeks of early development, and it often comes with some of the most intense first-trimester symptoms.
How Your Baby Is Developing
At this stage, the embryo measures roughly 14 to 20 millimeters from crown to rump, with 16 millimeters being a typical measurement. That’s a little over half an inch. Despite being tiny, your baby’s body is remarkably busy. All of the major organs and body systems are actively developing. The hands and feet have formed but still have a webbed appearance. Eyes are becoming visible, and the ears are starting to take shape.
The umbilical cord is now fully developed, serving as the lifeline that transports oxygen and nutrients between you and the embryo. A heartbeat, which first appeared around week 6, is now well established. If a healthy heartbeat is detected at 8 weeks, the chance of the pregnancy continuing rises to about 98%.
Common Symptoms at 8 Weeks
Week 8 tends to be peak territory for first-trimester symptoms, driven largely by surging levels of progesterone and estrogen. You may be dealing with several of these at once.
Fatigue is one of the most universal complaints. Rising progesterone levels can make you feel exhausted in a way that sleep doesn’t fully fix. This isn’t laziness; your body is channeling enormous energy into building a placenta and supporting rapid cell growth.
Nausea often hits its stride around now. It can show up in the morning, the evening, or all day long. Closely related are food cravings and aversions. Foods you normally enjoy may suddenly seem repulsive, while unexpected cravings appear out of nowhere. Both are driven by hormonal shifts.
Breast tenderness is common as hormonal changes cause breast tissue to swell. Your breasts may feel sore, heavy, or unusually sensitive. Bloating and constipation are also typical, because progesterone slows down your digestive system. Headaches can crop up more frequently for the same hormonal reasons, and mood swings are normal as your body adjusts to the flood of estrogen and progesterone.
Changes in Your Body
You probably won’t have a visible bump yet, but things are shifting internally. By week 8, your uterus has grown to roughly the size of a tennis ball, up from its usual size of a small pear. That growth can create a feeling of fullness or mild pressure in your lower abdomen, even though nothing is visible from the outside.
You may notice that your pants feel slightly tighter around the waist, mostly from bloating rather than the uterus itself pushing outward. Increased blood volume, which begins ramping up in the first trimester, can also leave you feeling warmer than usual or slightly flushed.
Your First Prenatal Visit
Many people have their first prenatal appointment around 8 weeks, and it’s usually the most thorough visit of the entire pregnancy. Expect it to take longer than future appointments because it covers a lot of ground.
Blood work is a big part of this visit. A complete blood count checks your red blood cells for anemia, your white blood cells for immune function, and your platelets for clotting ability. You’ll also be tested for blood type and Rh factor, which matters for compatibility with the baby’s blood. Screening for infections is standard, including rubella, hepatitis B and C, HIV, other sexually transmitted infections, and sometimes tuberculosis. A urine sample checks for urinary tract infections and provides a baseline for monitoring kidney function throughout pregnancy.
Your provider will likely do an ultrasound at this visit or schedule one nearby. This is often when you see the heartbeat for the first time and when gestational age is confirmed based on the crown-to-rump measurement.
Nutrition and Supplements
If you’re not already taking a prenatal vitamin, now is the time. Folic acid is the most critical nutrient in these early weeks because it helps prevent neural tube defects, which form in the first 28 days after conception. The recommended amount during pregnancy is 600 micrograms per day of dietary folate equivalents. If you’re at higher risk for neural tube defects (due to family history or certain medications), your provider may recommend a much higher dose.
Iron needs increase during pregnancy to 27 milligrams per day, up from 18 milligrams for non-pregnant adults. Low-dose iron supplementation starting in the first trimester is generally recommended, though the exact form and dose may vary based on your bloodwork results. Iron can worsen constipation, so pairing it with plenty of water and fiber helps.
Omega-3 fatty acids, particularly DHA, support brain and eye development. Experts recommend at least 250 milligrams per day of DHA plus EPA, ideally from two to three servings of low-mercury seafood per week. If you don’t eat fish regularly, a DHA supplement can fill the gap.
Warning Signs to Watch For
Some cramping and even light spotting can be normal in early pregnancy, but certain symptoms need immediate attention. Contact your doctor or go to the hospital right away if you experience severe pain or cramping in your lower abdomen, especially if it’s accompanied by vaginal bleeding. Pain at the tip of one shoulder combined with bleeding can be a sign of an ectopic pregnancy, which requires urgent care.
Dizziness or fainting alongside any of these symptoms also warrants immediate evaluation. Heavy bleeding that soaks through a pad, or bleeding with clots, is different from the light spotting that some people experience in the first trimester and should be assessed promptly.
What Helps Right Now
The combination of nausea, fatigue, and emotional swings can make week 8 feel relentless. Eating small, frequent meals rather than three large ones often helps with nausea and bloating. Keeping plain crackers or dry toast nearby for first thing in the morning is a simple strategy that works for many people. Staying hydrated matters more than usual, particularly if nausea is limiting what you can eat.
Rest when you can. The fatigue of the first trimester is physiological, not something you can push through with willpower. Light movement like walking or gentle stretching often helps with bloating and mood, even on days when the couch feels like the only option. This intensity of symptoms is temporary for most people, typically easing significantly by weeks 12 to 14 as hormone levels stabilize.