Help 20yr old maid bagged up

A stud got in with my 20yr old maid pony mare vet and friends told me no way she would have caught first try! Guess what my rolly Polly pony is fully bagged up and has all the signs she is about to foal! Any advice would be great I have vet on call and everything ready but most births I have been around go smootly and I just watched! What should I 2watch for?
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Has a vet actually been out to ultrasound and confirm she is pregnant?

No my vet is still telling me there is no way she is pregnant! And she definitely is! Trying to get ahold of another vet but not having any luck I had worked her due date out as Aug 23/12
My only concern is that mare and foal are okay.
I just wanted some opinions as to what people thought
Can a maiden bag up for no reason? I personnally don't think so but.....could this happen?

Posted picture of her bag and her in my album my phone won't let me post on threads

I HOPE that she is pregnant bc bagged up and not pregnant with a mare that's never had a foal might mean she has breast cancer.

Wow really I didn't know that but she has milk

You stated the Vet said no way, But have you paid for a Preg check ? Has she been palpated ? I had a mare that would bag, drip 'milk' she was a bit chubby and would develop fat by her bags and drip , not really milk, but kinda like a false preg .

My vet hasn't come out she laughs at me when I call her. That is why I am searching for a new vet she keeps telling me not to waste money. Is your mare a maiden that dose this and dose she still go into heat? Cause my mare hasn't went in to heat since. And you can't miss her in heat she is rude and humps my other mares.

Equine Vets in Canada

This might help find a new vet

You definitely need to get a vet out to see your horse. Your vet should be willing to come out if you are concerned, and if she is really laughing and refusing to come out, you need to drop her unprofessional arse and find someone new. And the bottom line is you NEED to get a vet out NOW to first, make sure the mare is indeed pregnant, and work out a plan of action. By not doing this, you are risking death or injury to mare and foal, if she is actually pregnant.