I have been on birth control for two a month now. During the second month I threw up at least three pills and at least two or three times a week took my pill two or three hours late. I have unprotected sex about three weeks ago. The day after sex I had a super light period. It lasted about two days and was very early. Now I have got my regular period today about four days late. I was a little worried that the bleeding after sex was implantation bleeding or something along those lines then I was late and that worriedme even more. Could that still be an option with getting my period today? Would it be smart to take a test anyways just to be safe?