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Weekly Pregnancy Guide - Week 3
Weight: <0.1oz <1g
Length: <0.01" <0.1mm
Heart rate : N/A N/A
Congratulations! Your baby has just been conceived!
The fertilized egg starts to divide (multiplying by 2 each time), as it moves from the fallopian tube to the uterus.
When it reaches the uterus, it is a ball of 32 cells, and it searches for a place along the uterus wall to implant itself.
Towards the end of this week, the egg implants itself to the the outer lining of the uterus. It is now called a "blastocyst", and is mainly hollow and filled with fluid, barely visible in your uterus.
By the end of this week, there will be around 250 cells in total.
Once conception occurs, your body releases a substance called Early Pregnancy Factor to prevent your body from treating your baby as a foreign invader.
After implantation, the blastocyst will secrete hormones that will cause your body to not shed the uterine lining (hence you will miss your next period).
You might experience some spotting or bleeding at the time the blastocyst implants into the uterus.
You probably won't be noticing any real changes in your body yet.


Week 3 Fetus Picture(s):

week 2 embyro blastocyst

week 2 embyro blastocyst

Week 3 Pregnant belly picture:
week 2 - pregnant belly


General Introduction to Pregnancy
Your Changing Body + Pregnancy
Your Baby’s Development
Potential Pregnancy Complications
Labor and Delivery
View all 
General Introduction to Parenting
Child Nutrition
Childcare and Education
Sleep in the Early Years
Baby Milestones
View all 


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