The only way to find out is to eat something and then test 2 hours or so later.
I find that one piece of fruit eaten with a meal is usually OK. It all depends on how many carbs you eat at that meal and what the fruit is.
Fructose is sugar, and fruit tastes nice because it has fructose in it, some sorts of fruit have more than others. Peaches and Nectarines are about half way good/bad. Mind you, as a frequent visiter to Spain I know how big they can be there, size is important in this case.
H