I have the same problem, also. I figure its just hormones. As my midwife says pregnant women are more 'juicy', but I think its not really a good productive sort of juciness.. at least not for me . was that TMI?
Anyways, I think its probably normal. You're in your last trimester too, as I am, and for the last month or so things are just too weird down there. Nothing feels right at all... its quite uncomfortable, so I'm just avoiding the discomfort for now.