What happens when an egg is fertilised by a sperm. I know that if the egg is not fertilized it causes the uterus to thicken and bleeding happens. But if it is fertilized, will that egg move to the womb and my periods stop?

Yes, if a fertilized egg (embryo) doesn't implant (attach) into the womb, the womb lining will thicken and you will have a period. If the embryo does implant, your periods will stop though you might have a small amount of bleeding at implantation.

The moment of conception
Normally, only one sperm can break through the outer membrane of the egg; once the sperm enters the egg, the sperm loses its tail.

Implantation
After six days, the cluster of cells develops a hollow cavity. Called a blastocyst, it attaches itself to the wall of the womb. Some cells grow into the womb''''s lining and the fetal life-support system (the placenta) begins to form.

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