If you prefer subsidised costs then can go to the polyclinic to get a referral to the hospital of your choice, NUH, KKH or SGH. If private all with 1 gynae throughout all your checks then call your preferred hospital to book for an appointment.
You can go polyclinic anytime now and get a referral. coz the appointment will take sometime .. maybe around 7 or 8 weeks for first check up :)