You can call SGH and request your personal gynae preference. Once appt secured, cancel the appt at KKH.
When you go poly they will refer to you at two hospital. For me, was KKH/NUH. Ive choose both for two pregnancy.
My second pregnancy I wanted NUH but because they have no slot, I was also having medical issue I was referred again to KKH, they follow up with all appointment. Then I call up NUH to cancel all appointment.