Hello and welcome to the forum Wandawoo. You’ve landed on a great site with many knowledgeable members here. It’s a great community.
When your blood sugar is higher than you expect it is worrying. I’m assuming the blood tests you had done are what they call a HbA1c test. Is a standard diabetes test that measures what your average blood sugar was over the last three months. Basically glucose sticks to the hemoglobin in your red blood cells. The higher your blood sugar/glucose is in your blood the more hemoglobin sticks to those cells. HbA1c measures the amount of glucose sticking to those cells. The test tends to be weighted towards the end of this 3 months. In the UK this is measured in mmol/mol. Your tests shows two readings 3 months apart - 39 & 41 mmols. Realistically, even though it shows a small rise, this rise is negligible. You could have had a few carby meals in the last couple of weeks or so and that could possibly account for the rise, nothing to worry about. In the UK 42 is the figure that is used to differentiate blood sugar that are considered normal from blood sugars that are called pre-diabetic. Your blood sugars are in the normal range. It is only to be expected that one’s blood sugars fluctuate slightly. Most none diabetics blood sugar ranges between 33. - 39.
Your diet has the biggest impact on your blood sugars , especially foods that are heavier in carbs, like pasta, rise, potatoes, bread, root vegetables, deserts, pastries and beer. A small reduction in meals that contain higher amounts of these carbs may well reduce your HbA1c numbers, that said your blood sugars are still in the normal range.