Last year my mare made me wait almost an entire year, and she didn't even look pregnant until after her "due date". This year she looks like a monster, and it appears she is starting to bag up a smidge. We are at day 268. Here is a last month picture of the monster, her last month udder, and today's udder. Not enough for me to be worried, but I'll be keeping an eye on her. I'm wondering if she will go early this year.