dont know if he came in me. what if im pregnant?

help!
i dont know
is it possible forme to be pregnant?
i had unprotected sex about 3 weeks ago
i was intoxicated and i cant remember if he came in me or nott
i had my period at the time
i cant be pregnant? can i? i really dont want to be
im only 15
i have been having alot of discharge recently
is this abnormal? like a sign of pregnancy?
my period is still at the stage where its not regular. sometimes it comes every two weeks and sometimes it comes ever four weeks.
its been 3 weeks and im really worried
i dont know what to think
at first i thought i was getting morning sickness
but the doctor said that i just had a stomach bug
i didnt mention that i had been sexually active.
does anybody know
i know the only way you can completely be sure about not being pregnant is abstinence but what is done is done
i need help
and reassureance.
i cant wait for my period!
HELPP