So besides the giant belly, I've been trying to breed her to my stallion for two months, with NO interest from her and I've NEVER seen her show any signs of being in season. A couple days ago I just stared at her belly and saw movement three times (although it is possible it was muscle twitches from flies... but I don't think so). Yesterday I think I felt a foal move (but she isn't too fond of me touching her belly too much so it's hard to say with certainty, but it was in the right spot and sure felt like a foal!). Also felt her udder yesterday, one side is bigger than the other, starting to bag up just a bit.
I should hopefully know tomorrow. Here's pics