My mare was confirmed in foal with a blood test at 4 months, then with an ultrasound at 6 months. Now here we are over a year and no foal. Weefoal is only accurate to 300 days, and ultrasound isn't supposed to be very helpful at this point either. My vet won't palpate a mini. She doesn't have much of a belly or a bag, but she is a maiden. What other options do I have?