130 or 140?

Laura
I feel like I am reading conflicting information with my doctors info. I have to test myself 1 hour after eating and my number has to be under 120. 
I hear a lot of other people saying they test after 2 hours and have to be under 120. Or they test after 1 hour and have to be under 140. 
I wish it was more standard. 
Most of the time I am under 120, but sometimes I'll get 125-130 and I am beating myself up about it. It's so frustrating.