I have a history of recurrent miscarriage and stopped all personal training but have kept up yoga. I did change to a general/easier class bc before I was doing an advanced class. I don't do any inversions though but can do all other poses. I'd see if you can do a trial class of either pilates or yoga and see how you go. I am sure either would be fine and like any exercise in pg you just take it a little easier and if it is uncomfortable stop and tell the instructor so they can give u a variation of the pose