Hey Joanna,
I was thinking the same thing with Bea. If you get a vet out, he may be able to do an ultrasound. My vet wasn't able to do it rectally but we were still able to see a bunch of fluid in her abdomen (which obviously if she hadn't been pregnant she would have been dead the next day) and things that looked like bones. I recommend checking her for an udder every evening, if she gets any vitamins at night then that is a great time to do it. She won't need grain until the foal is born but making sure she is getting all her vitamins and minerals is so important! Bea was a maiden mare too and she still bagged up about 5 days prior to giving birth. In my not-so-experienced opinion, your mare does look pregnant! On the "Eve" of Cora's birth, Bea started to drip milk at around 9pm and then gave birth around 11pm. I was checking on her every few hours instead of staying with her all night because I know they don't like to give birth while being watched and I didn't have a camera. I came down at 1am and there she was! Bea had already dried her off and she was standing and nursing. Bea has been such a good Mamma I'm so proud of her! I hope this helps, I will also post photos of Cora very soon, she is an angel!
