I've been using lutera for 3 months now and take it the same time everyday. One day I was 3.5 hours late and the two days following I took it at my normal time. Two days after being late I had sex without a condom for the first time. He pulled out and I wasn't very worried, but now it's three weeks later and I'm 3 days late to get my period when I've only been early or right on time before. I've read that precum can cause pregnancy and he swears he pulled out. Could I be pregnant?