Glucose Tolerance Test

A recent GTT produced these results:
Initial: 6.5
After 2 hs: 4.5

My test history has a range of 6.0-6.3 fasting. My diet is low in carbs to avoid going to higher values.

Is it possible that the GTT gives values LOWER AFTER 2 hs than at the beginning after fasting overnight?

My GP thinks it is OK buy such a result does not seem to fit with my history.

Thanks

Thank you very much for the replies.
I have no symptoms and I limit my CH intake because I know that if I don't my fasting readings go above 6.5.
Based on this glucose intolerance I consider myself to be in the pre-diabetes category.
I have a meter and I have been using it at semi-regular intervals for a few years to see how I'm travelling. I also have a proper blood test once a year.
The GTT suggests that my body can process glucose very well. This is not consistent with my history.
Also, when I did the GTT I took a reading with my own meter. The initial reading was almost identical to the blood test. The second reading after 2 hs was 7.5 vs 4.5 from the blood test. This is a huge difference but 7.5 would be more consistent with my history.
Either my meter is rubbish or the blood test is wrong.