I always had the vet come ASAP.......2/3/4/AM.
And that is find and dandy if that is what makes you feel better. There is very little that my vet can do that I can not. So not a big deal. If there is an issue that I need to have checked I have no problem calling the vet. Only had that need one time in all the years and she gave me the same advice that I had figured she would. I did it for peice of mine more then anything.
I had the foals checked and since I breed the mares on a foaling heat the vet checked the mares and put antibiotics inside them.