My gynae suggest not to start any exercise if you did not do any exercise before u are pregnant . Reason being you wouldn’t want to / wouldn’t know what u can or cannot do, hence may hurt urself . Maybe u want ask ur gynae for advice first
can check out sp pilates for prenatal pilates class. im doing that since start of 2nd tri
You can check on your personal trainer
Im using Alo Moves for prenatal yoga