I am on birth control. I take it everyday and I missed one day. I did not take two in one day because it makes me throw up. I took one pill everyday after that. My boyfriend and I had unprotected sex within the time before my sugar pills started. I am now on my new pack of birth control and have not started my period. I am getting a little worried and I don't know if it is because I took the Plan B pill or because I have been sick or what. Please help!