I bred my mare on a Friday with fresh cooled and flushed post breeding. The vet felt she was in the process of ovulating since it looked like her follicle was in a "8" shape; however, now I am suspecting it was two follicles side by side instead. We did not give her HCG since she thought she was ovulating and it was her foal heat so we were trying to delay ovulation as long as possible (she was bred on day 9 post foaling). Fast forward 17 days (Monday) we check her and she has an embryo but much smaller than we were anticpating based on the assumption she was ovulating that Friday we bred. The embryo measured 8mm. We rechecked her now 3 days later and the embryo is now 15mm. Is this a safe rate of growth and can we assume that she just ovulated later than we thought and is just behind? Generally speaking how many days along is a 15mm embryo? Thanks!
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