So I've been on birth control for three months now and I've taken it at the same time every day. My boyfriend and I have sex like almost every day....sometimes twice a day. But I've started to feel stomach pain. It feels like little cramps in my left lower stomach. Has this happened to anyone before? Is it normal? I know I can't be pregnant because I take birth control and always use a condom. And my period finished about a week ago. Anyone know what it could be?