Hi Kathy
There are newer types of Fescue that are supposedly safe as they are mold free. It is actually the mold on the grass that is not good for horses.
We live in Eastern Washington where it is very dry and they say we should not worry about Fescue. Personally, I would rather be safe than sorry so I do not let my mares out on pasture the last month or so of their pregnancy.
I would have it tested, then you know. Also too, unless you are breeding and have lactating mares this is not a problem.
Welcome by the way to the forum.