Me and my girlfriend had unprotected sex about a month ago. I did NOT ejaculate inside of her. Two hours after we had unprotected sex, she took the day-after pill (I read the earlier you take it, the more effective). After she took it, she had her "period" probably about 4 days afterwards, and then she had ANOTHER "period" 2-3 weeks later. So she had two periods in one month. Now (a month later), she's been having cramps since about 3 days ago but no period yet. She also says she has had mild headaches and a sore throat. what does this mean? is this normal?