I've been stressing this for the last few days. First, I've been on birth control (Ortho Tri Cyclen Lo) for six months. I've never missed a pill and I've never been late on taking one anymore than 2-3 hours. My boyfriend and I always use protection and we check the condoms religiously. But about two weeks ago we had unprotected sex SHORT unprotected sex, no longer than a minute. He didn't ejaculate but pre-cum may have been a factor. I'm almost 100% sure. Could I be pregnant? I've had the pressure in the middle of my abdomen but closer to my right side for the past two days and my breasts have felt more tender than usual. I also feel like my appetite has increased (but I could just be thinking that up). Acne has increased. I'm having slight cramps in the lower abdomen/vaginal area. Please, I'm very worried. If anyone could shed some light, please do. I know birth control when taken correctly is high effective. But things do happen.