When will my pregnant mare start to show?

  Ok so I am not sure and that is why I am asking ... the vet is coming out if 3 weeks for check ups and I will have him confirm it then ... she was sold and then sold back to her origanal owners then sold to me ... she was sold in june then returned and then sold to me last month ... she was underweight and is gaining it but still skinny and her belly looks to big for her size ... could the people who have bought her bred her and not old the old owners when they sold her back?

that is what Im thinking ... so she wold prob be 4 months along ...

what do you think?
Every horse is different, so I think it's great the vet is coming to confirm. He may pull blood or he may ultrasound her ..
my dads really good friends withour vet and none of us knew my nor thought my mare was preg untill we woke up one moning and their was a foal by her side she never was out of enery and nver gained any weight.