First trimester
Week 3 of Pregnancy
A seed is planted
Your baby this week
- If sperm met the egg, a single fertilized cell now begins dividing as it travels down the fallopian tube.
- It becomes a ball of cells called a blastocyst over about five to six days.
- Implantation into the uterine lining usually begins six to twelve days after ovulation.
What you may be feeling
- Usually nothing noticeable
- Occasionally mild cramping with implantation
Gentle tips for this week
- From here on, skip alcohol and smoking for the rest of pregnancy — major organs form in the weeks right ahead.
- Keep meals balanced; no extra calories are needed yet.
Common question for week 3
How early can a pregnancy test show positive?
Most home tests detect pregnancy from about the first day of a missed period. Early-detection tests can work a few days sooner, but testing after a missed period gives the most reliable result.
Every pregnancy is different. Sizes are averages, symptoms vary widely, and none of this replaces the guidance of your own provider.