I doubt you are pregnant because you said your AF came after you had missed pills and had sex. But you never know either, so you should definitely check into that. Birth control can really mess with your body especially when it comes to your cycle and breakthrough bleeding seems to be common also. Missing one pill normally would lead to spotting in my case. My body is very very sensitive to birth control but only combination pills. I had horrible nausea and vomitting. I was miserable! Last year I started taking a progesterine only birth control and I had absolutely NO problems. The only downside of pills with only one hormone is that sometimes you have missed periods or no periods, but this did not happen to me. My periods were very regular, no nausea. Nothing. The pill was also very effective in preventing pregnancy for me even though lots of people don't think so! But if you use a condom or the pullout method I really think you'd be safe and it really all just depends on your body. Some things work for some people and others don't. Anyways I would recommend this pill, I was on ortho micronor. Talk to your doctor about because it could be the right thing for you regardless of what people say :) Good luck!! And if you have any more questions feel free to ask me!