GUIDE
Your baby is the size of a raspberry — and all major organs are now in their earliest stages of formation.
Week 8 is a milestone. Every major organ system has begun to develop — heart, brain, lungs, liver, kidneys, intestines. The embryo is starting to make tiny, spontaneous movements, though you will not feel them for months. For many people, this is also the week of the first prenatal visit, complete with an ultrasound that can confirm the heartbeat and dating.
Be prepared from day one
Your baby is about the size of a raspberry — roughly 14 to 20 millimeters from crown to rump, or about half an inch. The embryo has moved beyond the simple cluster-of-cells stage into something that is beginning to resemble a tiny human.
All major organ systems are now in their earliest stages of development. The heart has four chambers and is beating strongly at 150-170 beats per minute — nearly twice the rate of an adult heart. The brain continues its explosive growth, with the cerebral cortex beginning to differentiate. The lungs are forming branching airways (bronchi), even though they will not be needed for breathing for another seven months.
The embryo's arms and legs have grown longer, and the hands and feet are now paddle-shaped with the beginnings of finger and toe ridges. Elbows are forming. The face is becoming more defined: the upper lip and nose are taking shape, and the eyelids are beginning to form over the developing eyes. The ears are becoming recognizable as small folds on the sides of the head.
Perhaps most remarkably, the embryo is moving. Tiny, spontaneous movements — twitches, flexions, gentle arching — are happening as the nervous system begins to activate muscles. These movements are critical for proper muscle and joint development, even though they are far too small for you to feel.
For a look at what happened last week, see our week 7 guide.
Symptomatically, week 8 can be one of the most challenging of the first trimester. hCG levels are approaching their peak, and the hormonal effects on your body are at full force.
Morning sickness may now feel like an all-day affair. The nausea can be compounded by fatigue, food aversions, and a sense of smell so acute it borders on the supernatural. Many people find that they are surviving on a limited rotation of "safe" foods — whatever they can tolerate. This is fine in the short term. Nutritional variety can come later when nausea subsides. Right now, eating something is more important than eating the perfect thing.
Your uterus is growing steadily, though it is still about the size of a large orange and tucked within the pelvis. You cannot feel it from the outside yet, but your provider can assess its size during a pelvic exam. Your blood volume is increasing, which can cause mild dizziness, especially when standing up quickly. If your provider has confirmed the pregnancy with a dating ultrasound, you now have a more accurate estimated due date.
Emotionally, the first prenatal visit often brings a complex mix of feelings. Seeing the heartbeat on ultrasound can be profoundly reassuring and make the pregnancy feel tangible for the first time. It can also make the reality — and responsibility — of pregnancy suddenly hit home.
Every pregnancy is different. You may experience all, some, or none of these symptoms.
The first prenatal visit is the centerpiece of week 8. It is both a medical assessment and a chance to establish a relationship with your provider.
This comprehensive appointment sets the foundation for your prenatal care. Come prepared with your last menstrual period date, medication list, family medical history (both sides), and a list of questions. Common first-visit questions include whether your medications are pregnancy-safe, which screening tests you should consider, what exercise is appropriate, and what weight gain to expect.
Your provider will explain the available first-trimester screening tests, including NIPT (noninvasive prenatal testing), the nuchal translucency scan, and first-trimester blood work. These screen for conditions like Down syndrome and other chromosomal abnormalities. Understanding what each test can and cannot tell you will help you make an informed choice.
If nausea is severe, ask your provider about prescription options. Doxylamine-pyridoxine (sold as Diclegis or Bonjesta) is FDA-approved for pregnancy nausea. Ondansetron (Zofran) may be used in more severe cases. Do not suffer silently — effective treatments exist, and keeping food and fluids down is important for both you and your baby.
If you work, start familiarizing yourself with your employer's maternity leave policy, short-term disability coverage, and FMLA eligibility. You do not need to tell your employer yet, but knowing your options reduces stress later.
When in doubt, call your provider. No question is too small during pregnancy.
Next week marks a major transition: the embryo officially becomes a fetus. Fingerprints will begin forming, and the heart will be fully formed with four distinct chambers. You are getting closer to the end of the first trimester.
Next up: Week 9. If this is your first prenatal visit week, our first prenatal visit guide walks you through exactly what to expect. For nausea help, see pregnancy nausea remedies. And if you are looking for safe ways to stay active, our pregnancy exercise guide covers what works at every stage.
This guide is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider with any questions about your pregnancy.
