My period cycle is irregular, the older I have gotten. I am 18 years old. It's been months since I had real period and not just brown liquid for a day or two. I had unprotected sex for the first time last night, he pulled out but I'm worried the pre-ejaculate could make me pregnant since I've read that it may contain sperm. I took Plan B about 26 hours after, and since I'm irregular I don't know when I will get my period or if I will any time soon. I'm scared because of it, and I won't know if I'm pregnant or not if I don't get my period. Intercourse took place In the evening on April 7, around 10. And I took the pill the next day, around 11. I just don't know what to look for and I'm worried.