My mare is almost 7 months pregnant and I still ride her. Mostly bareback because she's warm and wide and comphy! LoL. I do mostly walking, a little bit of jogging, but it is getting difficult for her. She is very out of shape for riding so I only do light stuff with her. At a canter, she's actually quite unbalanced already so we don't do it.
I personally would only just until the 4th month of pregnancy and then stop and just keep her in shape. My mare started getting a belly in the 4th month, and now, its rather ummm...big. And the baby is moving now. Posted via Mobile Device