Hi Krista. I’ve answered this question a couple of times on this forum. It’s such an important issue that it bears being repeated as often as the question is raised.
Pregnancies are so very individual. Each one is different for the individual mom, as well as even with the same mom on successive pregnancies. I highly recommend always checking with the mom’s treating physician, and going with their recommendations since they are privy to medical information that we as trainers often are not.
I hope that this helps.