sing of something not good....
look around the house, in corners, and hidden places for other places the cat has pee'd
how old is the cat?
if 12 or more, take her to the vet. it is quite possibly a kidney infection that can be cleared up by medication... or cancer.
my cat had that, peeing blood too. what PO'd me was i was unemployed and my stepdad took her to the vet... the test to see if it was cancer or just a kidney infection was $80... he wouldn't pay that, just the $10 to have her put to sleep.
i was SO pissed. i grew up with that cat, it was 16 and i got her when i was like 7 or 8. i still hold a grudge about it a bit 12 years later