Pregnancy question: I am a healthy 22 year old. I had sex about four days before my period: just in case it came late I decided to take a Plan B-I think it was one or two days after having sex. My period came as expected, nothing unusual. Day 5 of my period, I had sex again. I did not take any EC and I m not on birth control but I rather naively assumed I d be fine and that he pulled out. It s been exactly a month since I had sex, so that makes me about six days late on beginning my period. I took two pregnancy tests, the first response brand, and they both showed negative. In your experience, can the Plan B delay the second period?