Okay so basically I had sex twice, on the 13th and 17th of this month. I'm 17 and my periods are a little irregular however, I was expecting mine on the 20th of this month. For the intercourse, we used condoms (durex extra safe) and he even pulled out before he came. Holding the condom up for a few moments and I couldn't see anything dripping from them. Just in case though, I took an EC pill, about 28 hours after the first time and only 10 minutes after the second. I still have not gotten my period. What I wanted to ask was that given I had two dosages of plan B is it possible for it to delay my period? Also something I worry about is I was rubbing my parts against his boxers earlier during the first time. He did not come but its possible that there was pre ejaculate on his underwear that could have touched close to my vagina. The cloth did not enter my vagina at any point. What should I make of this? Should I be concerned?