I Have Never Had An Elevated Fasting Blood Sugar. HGB

I have never had an elevated fasting blood sugar. HGB A1C is 5. I am overweight but have never been diagnosed as diabetic. However, my blood sugar today (checked on my husband's glucometer) was 64, not fasting and after a sugary food. I ate some chicken later and the reading was 77. I've been experiencing sweats recently and figured it was related to weight. However, now I'm wondering if this is related. Could this be a pre-diabetic stage?