Week 8 of Pregnancy
Learn about your baby's development and what to expect at 8 weeks pregnant.
Baby's Size This Week
Baby Development at Week 8
- ● Your embryo is approximately 1.6 cm long (about the size of a raspberry) and developing at a remarkable pace.
- ● All four chambers of the heart are formed and beating at about 150-170 beats per minute.
- ● Fingers and toes are forming, though they are still webbed together with thin skin connections.
- ● The tail-like structure from earlier weeks is nearly gone, and the embryo looks increasingly human-shaped.
- ● The retinas of the eyes are beginning to develop pigment, and the tip of the nose is clearly visible.
- ● The embryo is making spontaneous movements — tiny kicks and stretches — though they are too small and early for you to feel.
Your Body at Week 8
- ● Morning sickness may be at its worst this week — nausea and vomiting typically peak between weeks 7-9.
- ● Your uterus is now about the size of a large orange, though your bump is not yet visible to others.
- ● Fatigue may feel overwhelming as your body produces up to 50% more blood to support the pregnancy.
- ● Breast tenderness and growth continue — you may need to invest in a more supportive or larger bra.
- ● Vivid dreams or disturbed sleep are common due to hormonal changes and frequent nighttime urination.
- ● You may feel short of breath as progesterone changes how your body processes oxygen, increasing your breathing rate.
Week 8 Checklist
- ☐ Attend your first prenatal appointment if scheduled (typically between weeks 8-10).
- ☐ Ask your provider about first-trimester genetic screening options (NIPT, nuchal translucency scan).
- ☐ Get recommended blood work done: blood type, Rh factor, CBC, STI screening, and rubella immunity.
- ☐ Rest as needed — fatigue is normal and energy will likely return in the second trimester.
- ☐ Stay hydrated and eat small, frequent meals every 2-3 hours to manage morning sickness.
- ☐ Discuss any medications or supplements you are currently taking with your provider for safety review.
Frequently Asked Questions
What happens at the first prenatal appointment?
Your first prenatal visit typically includes: confirming the pregnancy with urine/blood tests, establishing your due date, a complete medical history review, blood work (blood type, Rh factor, CBC, rubella, hepatitis B, HIV, STIs), a pelvic exam, possibly an ultrasound, discussion of genetic screening options, and guidance on nutrition, exercise, and prenatal vitamins.
What is NIPT and should I get it?
Non-invasive prenatal testing (NIPT) is a blood test that screens for chromosomal conditions like Down syndrome (trisomy 21), trisomy 18, and trisomy 13 by analyzing fetal DNA in the mother's blood. It can be done as early as 10 weeks and is over 99% accurate for Down syndrome screening. It is recommended for all pregnant women by many providers. Discuss the benefits and limitations with your doctor.
When does the embryo become a fetus?
The embryo officially becomes a fetus at the beginning of week 9 (after 8 completed weeks). At this point, all major organ systems have been established in basic form. The fetal period (weeks 9-40) is focused on growth and maturation of these existing structures rather than the formation of new ones.
Is it safe to dye my hair during pregnancy?
Most research suggests that hair dye is generally safe during pregnancy, especially after the first trimester. The chemicals in hair dye are absorbed in very small amounts through the skin. To minimize exposure, consider waiting until the second trimester, use dye in a well-ventilated area, wear gloves, and consider highlights or balayage instead of full-scalp applications.
What is my Rh factor and why does it matter in pregnancy?
Your Rh factor is a protein on red blood cells — you are either Rh positive (have it) or Rh negative (do not have it). If you are Rh negative and your baby is Rh positive, your immune system could produce antibodies against the baby's blood cells. This is prevented with an injection of Rh immunoglobulin (RhoGAM) given around 28 weeks and after delivery. Your blood type is tested at your first prenatal visit.
Track Your Exact Pregnancy Week
Use our free Pregnancy Week Tracker to find out exactly how far along you are based on your last menstrual period or due date.
Track My Pregnancy →Sources
- ACOG
- WHO Fetal Growth Charts
- Mayo Clinic
Medical disclaimer: This content is for informational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider for guidance specific to your pregnancy.