the vaginal and urethral areas are rich in blood supply just like the inside of your nose. it doesn't take much irritation to make these mucosal areas bleed but it would be nice if you (or your medical provider) can find the source. sometimes the tiniest of little tears can bleed. some urinary tract infections will present initially as bleeding so having a urinalysis would be good to make sure you do not have an infection.
i recently noticed that after i pee when i wipe there is some blood. but there isn't any blood in my underwear. i noticed this on sunday. there was a lot of blood but i finished my period a few days before hand. i don't know what's wrong this has never happened to me before. i can only see blood when i wipe. . i am not on my period.