Strange Experience Kk/Thomson

I had undiagnosed diabetes (I didn't get diagnosed but I was bringing it down with diet control and exercise and it was coming down). Then I got preg. And I went to check my sugar immediately and it was high. Went to Thomson gynae for first visit and she wasn't too concerned. She said don't need meds. She asked me to exercise and cut down on carb. Then happened to go KK emergency because had some discharge. KK doc was very worried about sugar and now I am going to follow up at KK for the sugar (subsidised). At appt with my Thomson gynae, she said if KK prescribes meds.. Just take. Wondering how she went from no meds to take meds. :/ that means if I didn't go KK I would have been doing a disservice to my baby....