Anybody else having trouble figuring out contractions?

Myranda

Seriously, like my lower back will ache and let up, or I'll have like a period like cramp that'll last a minute or two. I'm due the 21st, but I'm supposed to call my doctor if I have contractions 12-10 minutes apart or less and I'm trying to focus on this. Anybody got tips? Maybe start timing when I notice the pain and just focus till it stops?