[CheyAut]

but i was told 3 weeks ago a colt got into the mare's field.

You said three weeks ago. I guess you meant you were told three weeks ago that it happend 10 months ago?

That does not look like an advanced pregnancy, and you already had your vet check, so I would say not pregnant. If you are still convinced, then have another vet check her. I HIGHLY doubt a vet could miss a foal that's near ready to be born though, they take up a lot of room in the mare!

 

[CheyAut]

I know people who's maiden, non-pregnant mares gave them fluid when their udders were tested, so it's not a for-sure sign of pregnancy either.