I haven't had my period for 4 months. I was on birth control for one year. December I stopped taking it and January my period came very heavy just like before I was in birth control my period was the same for February, but March it was delayed 11 days and I haven't had my period since April. I took 10 days of the medroprogestrone and I waited 10 days after taking it. My Obgyn was sure that it was going to force my period to come but it never dide. I don't know if I should be worried or not.