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Hi, Welcome to JustAnswer. You're through to Dr Chris, a Vet based in the UK. I am reviewing your question and will get back to you shortly
Thank for your question. I appreciate your concern here, however the gestation period in a horse is highly variable (much more so than other animals). Many consider anywhere up to 380 days to be a nornal gestation period. So long as we do not have any concerning signs (malaise, poor appetite, colic, fever or abnormal vaginal discharge) then we can wait a little longer.
If we get to 380 days with no sign of anything happening then I would veetainly get your vet out to see her to check that everything is still OK with the pregnancy.
I hope that answers your question? Please let me know if you need any further help or advice.