Fasting glucose levels rising before labor?

My fasting glucose levels have been good for weeks but the last few days they’ve been elevated (93, 96 and 105 today). I couldn’t find an answer on Google, some say it rises and some say it lowers before labor.

I will be 38 weeks tomorrow, I plan to ask my doctor today but I wanted y’all’s thoughts/opinions as well.

Also, not sure if it matters but I am not on insulin. I do take 500mg Metformin with breakfast.