Im 16 & I am on my second month of birth control (Tri-Previfem) & am on day 17. I got my period today which is weird because it usually comes later. I missed one pill in the first week but took it as soon as I remembered (took two pills in a day). Should I be worried? Should I keep taking my pills as normal? If so, if my period finishes while im on the "reminder" pills is it safe to have sex?