On Pill, Bleeding While Urinating After Unprotected Sex. Cause For Bleeding?

I am on the pill . I sometimes skip the reminder pills if my period is on and start the sunday pill.... Monday I had no more bleeding all day so at about 2am me n my bf had unprotected sex. I was fine used bathroom everything was fine got up next day around 9am and had some red blood on toilet paper. took a bath that night stepped out and brownish blood came dripped out a little. today had the brown blood on toilet paper its not a period cause its only when water gets in me or when i pee.