About a week ago, I hooked up with a guy. I've been on birth control for about 6 years, but when we had intercourse, I was on an antibiotic twice a day. We used a condom, but neither of us realized it had bro ke until he had ejaculated. We immediately went to the store and bought plan b and I took it. A day or two later I experienced brown discharge. After taking the plan b pill, I stopped taking my antibiotic. As most girls would be, I'm worried that I could be pregnant. As directed by my doctor, I have my period once every three months. Should I take my period early this time?