Que our 4 year old AQHA mare is due to foal on March 13th. Generally my mares have started to bag up a month prior to foaling. Yesterday Que had no bag at all and today it is about 1/4 of the way full. I have never known a mare to advance this fast. I was wondering what hte rest of you had experiences with? How long do your mares generally start to bag up before foaling?