Spoiler alert: Once it arrives during week 4, it will implant itself in the uterine wall and grow for the next nine months. As it divides, the blastocyst, as it's now called (don't worry, you'll come up with a cuter name soon), travels this week from your fallopian tube to your uterus - a trip that takes about five or six days. Some will form the embryo, others the placenta, but for now, it’s still just one microscopic ball of cells that’s one-fifth of the size of the period at the end of this sentence. Within hours, it divides into two cells, then four, and so on, until the growing cluster comprises around 100 cells just a few days after that crucial first meeting between sperm and egg. Once the winning sperm makes its way through the egg's outer layer, the single-cell fertilized egg - or zygote - immediately forms a barrier to keep other sperm out.īut your zygote doesn't stay single for long. You ovulated this week, and the moment you’ve been waiting for has finally arrived: You’ve conceived! Meaning your soon-to-be-fetus has started on its miraculous transformation from solitary cell to bouncing baby boy or girl. Only 8 months to go! Still have questions? Here's some more information on how weeks, months and trimesters are broken down in pregnancy. If you’re 3 weeks pregnant, you're in month 1 of your pregnancy.
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