I had sex for the first time 2 days ago. The condom failed. however I am on birth control (yaz). I would like to take a pregnancy test to make sure that Im not pregnant. the instructions say you can take it the first day after your missed period but since im on birthcontrol I am only having 1 every 3 months and I wouldnt really know if I was missing a period or not. When should I take it? can I find out early enough that I could take the morning after pill?