But puberty is a bitch, and my body has decided it's time for me to care about having foals so it's doing its best to make that known when a mare in heat is around by making the fact I'm old enough to have foals visible to others in the easiest way possible, and I just got a taste of that. As for my specific situation, what I smelt before was most likely a mare in heat and my body did what it knows to do.