Mare not in season, showing time for pregnancy?

sounds to me like she may be in foal. if she was turned out with a colt it its very likely he covered her, you just may not have seen it. a 3 yo colt would be more than capable of getting a mare pregnant. best bet would be to get a vet to palpate her and they will either shake hands with a foal or they wont. if shes not then i would want to know why she not coming in season. has her temperament changed at all, is she getting tired easily when you work her hard, is her recovery time after exercise getting long, all things that could point to her being in foal. def get a vet to check her tho cos if she is in foal she is gonna need changes to her diet, steadier work etc etc