pregnancy care (Brisbane)

Hi, I am a dutch citizen, temporary in Brisbane for work. I am pregnant (1st trimester) and need some follow-up utrasounds Protected content Protected content in Brisbane before going home in 4 months. What is the best way to proceed? Go to a GP first, look for a midwife or go to the Ob-gyn department directly? Are costs very different depending on these locations?

Thanks for your help and experience!