My expected date for periods was 12th March but on 9th only I experienced spotting for 3 days and then my regular period begin on the 6th day of my period I had unprotected sex and he ejaculated inside me. And after 3-4 days I'm again bleeding like regular periods. Cramps are also there and I also took birth control pill on the same night after having sex.  I hope I'm not pregnant. Please help.