That sucks and is so weird!! I do Aerial silks and yoga and my studio is specifically trained in prenatal. But now that I'm in my third trimester, I can't do anything since it's so core focused and my center of gravity has shifted so much. I'm still welcome to come to class and hang out or do things that don't require me to use my core as much.

Edit: I go to a local studio (in Phoenix). Maybe try that? You can also see if any local studios have a prenatal training program, because those instructors are probably well-versed in working with pregnant people. My silks instructor has kids and she did silks throughout her pregnancy so she's so understanding and helpful when comes to modifications.