i would say there just little pollyps (sp?). which i believe happen when you get older but a few months ago my little sister had the same problem and came to me all worried that she had an std. turned out to be nothing more than a yeast infection and the dr. said it was just pollyps. basically from being irritated by the extra wetness.
they are harmless and should go away on their own.
Ive had this before - (pre-pregnancy) once or twice - they went away no prob after a couple of weeks.
Ive only ever had one sexual partner and due to gynae problems have been tested for STDs a few times.
Ive never had an infection so guessing its just the hormones.
Just oils/glands/hormones I think honey. Show your doctor at your next check up.