Hi MissPinkUK
Welcome to the forum.
My sister has for the last 2 years on her annual blood tests come back with similar Bg levels as you, the doctor told her to loose weight cut out sugar, spuds, rice (go him) and behave or she will get DB.
she tried a bit the first year but then got told the same thing the 2nd year - in between the 2 I got diagnosed as Type 2 and started low carbing and lost weight as a result. This shocked her and made her see it will be her next year if she doesn't get her **** into gear.
So, 3 months on and she has also low carb'd lost weight and her doc is delighted to say the least. she may well evade or certainly delay a progression to T2
So, as grazer says you need a definitive test but it will be a good idea to have a look at what you're eating, as although you are "eating quite healthy now" what is healthy for a diabetic and non-diabetic are not necc the same thing.
Mary x