I've been on birth control pills for around 4 months, but I often (almost constantly) take them late. It's a bad habit that I've been trying to fix; but on the day that my boyfriend and I had sex, I realized that I had missed my pill by 4 hours. I took it as soon as I remembered and we also used a condom. I know that late pills can increase your risk of pregnancy than taking them at a usual time, so I was wondering if anyone had an idea as to my risk of pregnancy (don't know if this pertains to anything, but I've also been feeling a little nauseous lately).