False or really a baby?

Question
Okay last week i was brushing my horse.  And in front of her nipples was fat pockets (i was told).  she also has a line that goes all the way to the middle of her stomach.. I got her around last august, and she was starved, the vet said almost 200 lbs. under weight.. She has filled out a lot and has got some muscle on her now.  In the past 2 months her stomach has been getting fatter, and when i ride her, her stomach kind of goes out just in front of her stifle, and hips... Yesterday, i was cleaning her nipples off and it was all crusty, and then milk squirted out!!! I was like O NO!  She is around 20 years old, and where she came from their were studs, but she wasn't out with them.... I don't think she's pregnant but i don't know for sure... She has been in season 2 times since we got her... I don't know whats going on.. What do you think?

Answer
Hello Shawna!
Alright, the milking thing, well that doesn't mean she is pregnat. We have two mares at our barn who started milking, and have never been around a stuf in their whole lives. The vet said it was something in their feed.

The weight thing, well I would look into that. The way you described her weight, sounds like a pregnat belly. I don't know what to say, as i haven't seen pictures.