Nervous and needing answers

So I am on birth control. I have been on for two months. Me and my boyfriend had unprotected sex a few times this month. Last month I was on the pill me and him agreed not to have sex and to have the pill kick in I guess you could say. This mouth we thought it would be okay if we did. I am worried though. I have not gotten my period and it's very scary for both of us. Last month I had no problem getting it on the right time. I was suppose to get it today but I didn't. I did not miss any pills but I did take one or two maybe 3 hours late at the most. Any suggestions or advice. Please !!!!