from Private to Subsidised

hi mummies. i would like to know if any mummies have had any experience of changing from private hospital to fully subsidised under kkh/nuh. im currently 29weeks @ TMC. i just found out that i have low iron and im just thinking of plan B if incase there are complications, i would like to switch over to fully subsidised (nuh/kkh). reason being: wanna avoid the high bills. my question is: 1) i can just go to polyclinic to get a referral? 2) for the antenatal fees claimable under medisave, nuh/kkh will be able to process it for me right eventhough the bills were all from TMC? thank you in advance and would appreciate any other information related to this ☺️