I have intense pain, cramps and burning during urination also on lower abdominal part and upper part of clitoris occurred on the 2nd day of my periods after having unprotected sexual intercourse happened 1 day right before the periods came, however no any discharge in vagina and it has been 2 days having pain. I am tensed what should I do ,well I have confirmation that the both partners doesn't have any STI. I think it could be urine infaction ,tell me what could be possibility?