Will polyclinic refer me to kkh for gynae check up?

Hello I just found out im pregnant few weeks ago. I'm just wondering if I should straight away go to kkh for ultrasound check up or go to the nearest polyclinic and let them refer me to kkh? Because i would like to save cost using medisave etc. Any moms out there goes to the polyclinic for regular check ups and then give birth in kkh with any random doctor? Or do you stick through with one doctor until baby is born?