birth control and period messed up

So I have been taking Birth control (pill) for a month now and I haven't had my period yet. After I had my son I kept having my period every two weeks and I haven't had it for a little over a month. I'm not sure if it's the birth control messing with me or what but my husband did cum inside me two times around my second to third week of taking it. Has it happened to anyone else?