Week 3 of Pregnancy
Ovulation and fertilization occur. The fertilized egg begins dividing and traveling to the uterus.
Fetal size
Fertilized egg
- Length
- Not yet measurable
- Weight
- Not yet measurable
Fetal development
- Fertilization happens within ~24 hours after ovulation.
- The zygote divides as it travels down the fallopian tube.
- By the end of the week it nears the uterus, ready to implant.
Maternal changes
- Most people feel no symptoms yet.
- A small amount of implantation bleeding or mild cramping may occur as the embryo embeds.
Recommended checkups
- A pregnancy test is usually too early to be positive — wait until next week.
Jump to week
Textbook averages. Individual variation is wide and this is not medical advice — confirm with your OB.