I wouldn't worry too much, Sade. 6.8 is not abnormally high, and a lot depends on what you ate and drank the previous evening. Don't worry about the variations either - it's possible to gt two different readings from the same drop of blood! The meters have a slight inaccuracy variation, and blood sugar can change quite quickly.
In your place I would get Christmas and New Year over - no one can call this time of year 'normal eating' :lol: Then arrange to see your doctor or practice nurse to have a proper fasting blood test done at the surgery. Since diabetes runs in your family your GP should understand why you want it done, and much better to catch diabetes early, if you do have it.
Once again, try not to worry. Merry Christmas!
Viv 8)