Hello, My girlfriend and I had sex this weekend and I ejaculated in her, this was right after she had her regular period. She is on the birth control pill but we did use plan B twice this last month when I ejaculted in her just to be safe. She just finished her regular period less than a week ago and started again today saying she was bleeding/cramping heavily. What could cause her to start her period so soon after stopping. i am worried it may have been someting we did while having sex? She takes the pill regularly and we only used the plan B to be safe when I ejaculated in her. Should she take the plan b again this time, since she just started bleeding again. Please help we are both worried.....