uti ??

hey y’all so i had sex twice on thursday and i peed after the second time but it stung a little, then friday it wasn’t too bad, saturday i had to pee all the time and it just hurt constantly and when i peed, sunday it only hurt when i peed, and now it’s monday and it hurts a lot and there is weird fiber in my pee that ranged from light pink this morning to dark red/brown now. also when i wipe its bloody urine but in the toilet it’s not bloody ¿ odd. i haven’t gone to the doctor because i thought it might just go away, but now i’m thinking i should go. also i was wondering if peeing weird fibers is normal for a uti. thank you i attached some pics of the fibers but yeah i hope someone can have some insight!