Two or so weeks ago, my boyfriends condom broke. Not knowing when it had happened during intercourse, I decided to take Plan B that night, basically 2 hours later. Two days later, I went and got on birth control that I take strictly as directed. A week later I got my period, it was lighter than usual and a week early. My doctor told me since the birth control I had chosen, Loestrin, would lessen my periods to 3-4 per year, I didn't think much of it. I haven't had intercourse until tonight and I vomited. I'm not sure what that indicates... Any suggestions?