I have just started taking birth control. So I took a mononessa blue/purple pill the same day I started my period, or thought I started my period, and my period just stopped. Like nothing. Completely dry. I had some dried stuff for that day, but it cleared out then nothing. Is this normal? My boyfriend and I do have sex but we always use other methods of protection and have not had any accidents or close calls. I'm just worried I might be prego. Thoughts?