It is extremely rare for any issues to arise, and you will be very closely monitored. The birth control pill is taken for a short period of time. Then, you will use daily injections of a hormone called Gonadotropin to stimulate your ovaries. In a natural cycle, only one egg matures; Gonadotropin injections encourage more than one egg to mature for retrieval. Only the eggs matured for a particular cycle are harvested and have no impact on future eggs.