Once your mare is in foal, do you continue to re-check every so often, or just hope for the best? It's been a long time since I bred, and I think I remember doing a 90 day check then letting nature run it's course. But everything seems to be a little different with the minis, and of course things change over the years too. Also, what's a good time to do an external ultrasound? I think I remember it's easiest at a certain point but I don't remember what that point is.