I went to some classes. Personally I hated it but I think that's just me. I run and do circuits usually and despite being curvy I feel empowered and strong doing that. However, yoga made me feel ungainly and huge and I really struggled.
Having said that, I can see how it could be good if you stick with it for sure. I'll definitely try some of the positions that are meant to help with labour. I say go for it x