Scared my mare will breech. HELP!!?

She won't breach. aaccm (sorry I know I totally just butchered that) gave a great answer. Fescue toxicity causes agalactia and red bag. If it were my mare I'd do whatever I could to make sure someone would be there when she foals because if she does have red bag someone needs to cut it open asap or the foal will suffocate. Your mare will be fine, although if she does have red bag she's at risk for infection, however infections like that are easily cleared up with antibiotics and such. Just make sure if she has it at home you have the vet out as soon as possible.