Random blood glucose...?

I did a random blood glucose test yesterday and it was 11.1 mmol about 2 hours after my dinner.. what does that signify?

I have never been diagnosed with diabetes. but I found out recently that it runs in more or less all of my mums side of the family :S

I was kinda worried

Thanks in advance
Update: I tested in another hour after the first test and it was 8.5 mmol/L

I am 5'9 and weigh 11 st 6ounce

I get plenty of excersize..

and for my dinner I had boiled potatoes, with gravy.

I only ask as I am going to get blood test,
Update 2: I have lost a stone in a month without trying and always thirsty and been urinating a LOT more than usual :( x
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