I have a small white bump on my vaginal lip 12 hours after having unprotected sex. it was hard. i messed with it and fluid and blood came out. is is an std?

I think that most likely a duct of a gland in your vagina became blocked causing a cyst to form. An STD wouldn't manifest itself in only 12 hours after an exposure. The incubation period for most STD' s is anywhere from a few days to a few weeks. For the current ruptured cyst, observe for recurrent swelling,pain,spreading redness or drainage of pus or any continued bleeding or drainage. See MD if