The Inside Story: Your Baby in Weeks 1 Through 4

Week 3

Your fertilized egg, which is now called an embryo, continues moving down the fallopian tube, growing larger as cells divide. If the egg implants in the fallopian tube, you will have an ectopic pregnancy but this is a rare occurrence. More commonly, the embryo cruises down the fallopian tube just fine, growing into a solid ball of about 200 cells by the time it enters your uterus about four days after conception. The embryo usually bounces around in the uterus for a few days until it finds a suitable spot to implant in the lining.

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