ouch.

I woke up with a uti this morning, no big deal to me because im pretty prone to them. but when i went to go pee, it hurt extremely bad and when I wiped it was pink. im on day 1 of the antibiotics i had left over from my last one. but that has never happend to me before. im not spotting because I just got off my period a week ago. but why was it pink?