by ladylumps on Thu Sep 25, 2008 4:51 pm
If you have been taking your pill correctly, there shouldn't be a problem, its about 97-98% effective.
Plus, you would have to seriously be unlucky to fall pregnant on a one night stand whilst on the pill. Try not to worry though because stress can delay it also.
I thought you said you had sex on your period? Either way, it is the lesser likely time to fall pregnant, its usually 2 weeks after your period where its most likely.