So, I got back from a conference last night to find that Harley had a retained shed (taken care of after a long soak without too much assistance). Anyway, this morning I found what looked almost like a slug in her enclosure but not quite... It was definitely not poo or urates, but was much paler and smaller than I'd expect a slug to be. It seemed to be a plug of mucous-like material. The slugs/babies don't seem to have changed position at all; The skin where she had surgery last year is still kind of pinched, so I can see the position without doing anything.
She hasn't really eaten in a couple weeks (starting around the time she went blue for this shed) but is otherwise acting fine and a lot happier now that she's shed, and acting hungry so I'm going to feed her tonight.

Has anyone else noticed any sort of mucous plug passing before they give birth? If so, how long should I expect to wait before seeing something? I put her in with a male this year around mid-February, when she started acting like she wanted to mate, so I figure I'm probably going to be looking at a bunch of slugs if that mucous plug has anything to do with giving birth.