Mater private runs pg fitness classes and are run the hospital physio they are really really nice. Also you can claim on your private health bcos is run by a physio they were $50 for 5 classes prepaid or $15 per class. May have changes in the past few years.
Also there was a place at Toowong I used to go to Yogababy - was at Tarragindi so Toowong was only a 10 mins drive. Yogababy also does classes at Annerley. I also saw a physio at Carina who specialised in pregnancy bcos I was hip flex issues.