I have been taking birth control for about 6 months and have been decent about taking it on time. Recently, about three weeks ago, my boyfriend and I started to have sex. I was on my period, I have a very light flow that lasts two to four days. I stopped him after about four or five seconds because we weren't ready. He never came. I had missed my birth control on that day but remembered and followed the instructions of my pill and took two the next day. I then changed the time I take my pill to noon instead of before bed, around 11  at night. I realized I haven't been very regular with my times of taking it.