Well…Arielle had her 18-day ultrasound today. She has a vesicle that is exactly the right size to be an 18-day embryo, but the location makes the vet suspicious that it might be a cyst. She only has a small CL on the left ovary (the ovary from which she ovulated when she was bred) but has what looks to be a fresh CH on the right ovary…so she might have just ovulated. Ugh. I haven’t noticed any signs of her being in heat, but I only have mares here, and she is the dominant/aggressive one, so she doesn’t really interact closely enough with the other horses to show me anything.
The plan is to check her again next week. At that point, assuming she isn’t pregnant, we’ll short cycle again and hope for better luck on one last late-season attempt. Still waiting to hear back from the stallion owner about whether they’ll ship that late in the year. We’re also going to do a culture and cytology on that cycle. She might surprise us and be for sure in foal next week, but neither the vet nor I are holding our breath on that one.