Ok NEED AN ANSWER IF ANYONE CAN HELP!! GESTATIONAL DIABETES!?!?!

Kaui

Ok so I'm just wondering if anyone can help find out why my blood glucose level was higher then it should be 5 mins before the hour was up to actually test my blood!! See I wanted to see what the level was 5 mins before . Ok ok let me back it up here I was supposed to test at 10:45 am which would have been exactly and hour after eating. I decided to try to see what would happen if I tested 5 mins early , So I tested at 10:40am and it was 147 then again at 10:43 it was 146 and then the kicker was I tested again at 10:45 which is the actual hour test it was 143 so I'm just wondering if anyone can help me with Why in just mins it would change ?? Maybe this sounds stupid but if I didn't actually see it with my own eyes I really wouldn't know that a few mins make a difference from a bad reading to a better one🤦🏽‍♀️. I'm just curious if anyone knows why??