Good point...if the mare had any sot of ailments or needed any sort of meds to help her perform like most racehorses do, then it is obvious that she may not get the normal treatment from the vets if certain meds could effect her pregnancy at that infant of a stage...can't see where being pregnant would be a positive thing when it come to racing, but again, some fillies have run through it and won pregnant at high levels...but it probably takes the right mare to do that