Egg fertilizing sperm

Due Date Calculator Choose from a variety of options for a prediction of your due date. We use cookies to give you the best browsing experience. When the egg and sperm unite, they form a zygote. They may also help shape factors such as personality, intelligence, and the risk of some health conditions. This usually, but not always, happens through sexual intercourse. Defects in the fallopian tube may impair transport and increase the risk of a tubal pregnancy, also called ectopic pregnancy.