Hai,

Am a 20yr old girl.I had intimacy with my boy friend 2months back,we had our underwears on during the intimacy,after which I got my periods once.but this months it is on a delay.its around 50days & I still hav'nt had my periods.could I be pregnant?

No I don't think it's possible. Stress and other factors could delay your period. Perhaps even a health problem. I would advise that you go to your gynecologist just for a routine check up.