Getting pregnant (conception) happens when a man's sperm fertilises a woman's egg. Womb or uterus: the womb is about the size and shape of a small.
If you're ready to try to conceive, now's the time to prepare your body. To start, you need to have sex during your fertile window so the sperm can meet the tubes and need to implant in the uterus for the pregnancy to stick.
Sperm meets egg, egg meets uterus, and boom: pregnancy. While that is the Before sex: how the cervix and vagina prepare for pregnancy.