I am on my 2nd day of taking Tri-sprintec and started taking it for reasons other than pregnancy prevention. (I am an athlete and needed to be able to control when I have my period in order to avoid it intervening with racing). But I am probably going to have sex at some point soon, and I know the package says I should wait 7 days but as you can imagine it is extremely important that i NOT GET PREGNANT. I plan on waiting at least three weeks, but i am still nervous as hell that it might happen anyway. I don't feel any different than when I wasn't taking it. does any one have any advice/comforting statistics?