What Causes Irregular Periods And Pain While Urination After An Unprotected Sex?

Hi i got a question. well i been having unprotected sex with my boyfriend two months already this month my period was late 2 weeks but before my period i had pain every time i pee so i avoided sex cause i thought it was hurting me but then i had spotting few days after my period i thought it was remains but its been a week after my period and today i bleed when i used the restroom it seems like its my period again. i never had irregular periods.