sg1112

i noticed some blood on the toilet paper when i wiped. it was real light and a very very small amount not even enough to be called a spot. i was just checked for a possible fluid leak last week and everything was fine and i was not bleeding from my cervix or anything like that. well i went today and had a urinalysis done and the initial test came back fine but they are going to do the 48 hour culture just to make sure. why else would i be peeing blood if i didnt have some sort of UTI? the only other explanation i can find online is a possible kidney stone but it also says that with a stone i would be in a lot of pain and im not. i feel like i have a UTI cuz i pee constantly and i have some back pain and achiness in my lower stomach just like i did the last time i had a UTI. anyone else ever have this and had a different reason for it? i go for my 28 week check up on wednesday so ill get the culture results then but if that comes back ok then im out of possible explanations.