skv1899

Well, depending on how regular your gf is, (which (I wouldn't want to assume) but if she knows exactly when her next period will begin she sounds pretty regular) it's probably unlikely, but not impossible. If your extremely worried she can take an EPT test 4-5 days before her scheduled period begins (although it's less accurate the earlier it's taken and quite frankly those things freak me out because the longer they sit the more likely they are to show a false positive so 5 minutes means just that!). But it looks like you'll just have to wait and see. I wouldn't be too worried though. It might be too late now but in case it happens again she might want to read about Plan B and see if that's right for her or look into a backup form of birth control.