So i started birth control for my first time on July 21. I was told by my gyno to start it the day my period came, even if it wasn't a Sunday so i did. I then had my period for 11 days straight. I usually have it for 3-5 days. So that was July 21-August 1. My next period was supposed to be August 19 but i never got it!! On that day though i was bleeding a little bit but then it stopped. Now it's the 24th and i still don't have it. Should i be scared ?? Or is it the birth control ? Please help!