Sorry you had to make the tough decision.
Our mare was found with twins at 18 days too. However, we pinched one. The vet said in 95% of the cases the mare retains the other embryo.
Of course, my mare was in the remaining 5% and lost both.
Luckily, it was early in the season and we could get her covered again.
She produced a Concerto filly for us this Spring......
It's always a tough decision. Best wishes to you and your mare.
Dang.... twins
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