I Had Sex With My Boy Friend In Feb After

I had sex with my boy friend in feb after that In april i missed my period my date was 2nd so i went to a doc and she prescribed me sysron n 5mg tablet for 5 days after that i had my period on 12of that month which lasted for 3 days in march i had again my periods on 11th which lasted for 2and half days am i pregnant plz rply fast i am tensed and worried