Can high levels of estrogen stop you getting pregnant?

As it holds the egg in place as the estrogen thickens the walls of the uterus as estrogen is produce in the follicle on production of an egg for fertilisation. If the egg is not fertilised then the estrogen levels fall, allowing a woman to dispel the egg as the lining thins out which in turns brings on the mentrual cycle. Therefore it plays an important part in releasing the egg and holding it in place to be fertilised.