I'm on the pill, I've been on it for quite some time and it's worked great. However, I know that sickness can make it less effective. I got sick last Wed/Thursday only for about a day, I think it was a 24 hour bug or something, but I had a bit of sickness and diarrhoea, and I had sex on Saturday night, without a condom. I didn't even think about the fact that I'd been sick, because I felt fine. But when I got sick, it was during my pill free week, just before my period came. I know I'm still protected during this week, but could the sickness increase chances of pregnancy even though I wasn't taking any pills?