Metaformin

Had review after nearly 2 years , she says I only take 1/2 a dose ( 1 tab morn / 1 ev ) , said I was doing really well hbc ( think that’s it ) was 41 / 40 ish which she said was normal , this time 44 which is apparently pre- diabetis which is very confusing as I thought I had diabetis , but she said I am diabetic it’s just metaformin keeping it normal , now pre- diabetic
Next check in 6 months , so need to get back to normal , 40 ish .