Your Baby is the Size of a -----

Sperm meets egg

During the 24 hours after ovulation, your egg will be fertilized if one healthy sperm manages to swim from your vagina through your cervix, then up through your uterus into your fallopian tube, and penetrate the egg. There are nearly 250 million sperm in an ejaculation, and about 400 sperm survive the 10-hour journey to the egg. But it's usually only one that succeeds in burrowing through its outer membrane.

The genes combine

In the next 10 to 30 hours, the successful sperm's nucleus merges with the egg's and they combine their genetic material. If the sperm carries a Y chromosome, your baby will be a boy. If it has an X chromosome, you'll conceive a girl. The fertilized egg is called a zygote.

Implantation

The egg takes three or four days to travel from the fallopian tube to your uterus, dividing into 100 or more identical cells along the way. Once it enters the uterus, it's called a blastocyst. A day or two later, it will begin burrowing into the lush lining of your uterus, where it continues to grow and divide.

The Mutlu Anne app is with you every step of the way on your pregnancy journey.

Thanks for reading.