HELP!

the day after i got off my period i had sex with this dude, not my first time having sex or my first time with this guy but i have only had sex a few times. anyway- the nect morning i had blood in my urine. i am experiencing no pain, i wouldnt have even noticed if i didnt look down. i kinda brushed it off and went on with my day because ive heard people bleeding after sex (figured maybe my cherry poped? idk) but tonight when i went to the bathroom there was still blood in the toilet...im starting to get nervous...i still have no pain...WHAT DOES THIS MEAN?