Pregnancy week by week · First trimester
3 weeks pregnant: what's happening
A tiny beginning may be underway. If egg and sperm meet, the fertilized egg begins dividing as it travels toward the uterus. This tiny cluster of cells, called a blastocyst, continues to grow and divide during the journey.
What's ahead
Implantation may occur soon, followed by rising pregnancy hormones.
A memory to keep this week
Where you were during this quiet beginning
Write it down while it's fresh. In the app, each week has gentle prompts like this one, saved privately to your story.
In the app this week
Try this together: Make room for possibility, plus this week's memory prompts, a private journal and your Journey. One simple idea at a time, never 47.
Based on: NHS week-by-week guide to pregnancy, written in Brittany's words.
Every pregnancy and every baby is different. This is general, educational information, not medical advice. If something worries you, check with your provider or pediatrician.
