I M 20 Yes Old N I Hv Regular Sex

I m 20 yes old n i hv regular sex with my partner on 22nd march i got my periods n did sex ftr dat on 2nd n ate ipill n got periods on 5th april n it ws 7dys bleeding den i had sex on 12th april for 5-6 secs wdout condom n i hvnt got my periods till now i hv done pregnancy test 4 tymz n it had shown negetive n i m having cramps in my lower body parts n from 10 days n ders little amout of white discharge as well what can i do