About a week and a half ago i had protected sex and i noticed my period didnt come. Well three days ago i had unprotected sex and two days after i started bleeding and had symptoms of a bladder infection and it wasnt like my period. It was very light with few cramps and it only lasted for one day. Well now i have cramps in my lower back and on my left side and it shoots down my leg. Im having some heart burn and im really gassy. Im not sure what could be wrong.