Week 1 of Pregnancy
First trimester
For informational purposes only. This page is not medical advice. Every pregnancy is different — always consult your doctor, midwife, or healthcare provider for guidance specific to your situation. In an emergency, call your provider or 911 immediately.
Baby is
about the size of a poppy seed
0.1 inches · less than 1 oz
Baby this week
- •Conception has just occurred - a single fertilized cell begins dividing
- •The zygote travels through the fallopian tube toward the uterus
- •Chromosomes from both parents combine to form your baby's unique DNA
You this week
- •You likely feel completely normal - most people don't notice any changes yet
- •Possible mild cramping (similar to period cramps) as the fertilized egg travels
- •Breast tenderness may begin very early for some
This week's tips
- •Start taking a prenatal vitamin with folic acid if you haven't already
- •Continue healthy habits: balanced diet, regular movement, adequate sleep
- •Avoid alcohol, smoking, and recreational drugs
- •Take a pregnancy test around day 12-14 of your cycle for most accurate results
Informational only — always check with your doctor or midwife for advice specific to you and your baby.
Looking ahead
Next week, the fertilized egg will implant in your uterine lining, and your body will begin producing hCG (human chorionic gonadotropin) - the hormone that pregnancy tests detect. This is when things start to feel real.
Track your pregnancy on BringBaby
Join free to track your pregnancy week-by-week and find baby-friendly places to visit as baby grows.
For informational purposes only. This page is not medical advice. Every pregnancy is different — always consult your doctor, midwife, or healthcare provider for guidance specific to your situation. In an emergency, call your provider or 911 immediately.
This content is for informational purposes only and is not medical advice. Every pregnancy and baby is different. Always consult your doctor, midwife, or pediatrician for guidance specific to your situation.
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