0k I had sex 0n Saturday night July 31, 2010 well it was Sunday m0rning already like 1 am 0r 2 am but that f0ll0win Tuesday I t0ok plan be I g0t my peri0d the f0ll0wing week it was a n0rmal peri0d this m0nth was already August... but n0w it's the last day 0f September and I didn't get my peri0d this m0nth and were ab0ut t0 g0 t0 0ct0ber already and I haven't g0tten my peri0d I'm scared can sum0ne please answer my questi0n. Thanks

When you had the period in early August, were you due for a period at that time or did it arrive a bit early?

Try a pregnancy test. Plan B is not 100% effective just like any other form of birth control, emergency or otherwise.

It could be your periods are just off, which sometimes happens when Plan B is used. If the test is negative, give it another week and see what happens with your period for October.

You know what Im 100% percent sure he didn't *** in me but I just wanted to be precatious so I took the plan be just in case you know. My periods are always irregular; sometimes I get them at the end of the month, then sometimes in the middle or in the beginning. So maybe it could be plan B that messed me up. Before this the last period I had gotten was last Feb then I didn't get a period for March & April until May but I wasn't worried at the time because it had been a long a while since I last had sex. I don't know it could be that I'm so stressed out in college, and depressed hahaha I don't know I just get too worried and worry about the littlest things ever... Thanks!