I hv taken 2 emergency contraceptive pills with in 72 hr after mating, around 11 days I have got period but after a month my period stop. Is pregnancy?

May be expected. A common side effect of the morning after pill is menstrual irregularity. You can take a home pregnancy test just to be sure. If it's negative, then it's probably due to the emergency contraceptive pill. Also talk to your doctor about all the birth control options out there available to you. Take care!