Thanks everyone. She is a rescue, and would be coming on long term loan, with eventual ownership if it works out on all sides.
I would have the vet out as soon as we could, have her checked over and blood tested for pregnancy. They assume she would be due early summer next year.
She has been living in quite a large herd. According to the lany who rescued her, she was even calm when it can to loading her to move her to safer premises. She does seem very laid back, but I realise that could all change.
She would live in a herd with us, we have another 3. Once we have the all clear from the vet. Although the lady who rescued them did put them straight in with her herd, and they all on the face of it seem very well considering.
They werent rescued due to neglect, but because the guy who owned them is elderly and couldnt cope with so many of them, he kept 4 still though.
She is almost certainly in foal, as she ran with a 2 yr old from early summer, and a stallion in july. So im thinking of turn her out with mare who foaled this year, and is very laid back. We are lucky that we have all the room at home to be able to do it, so time wont be a problem, I could just do with lighter evenings to come around sooner!!