Timing Contractions Confused

Arizona • Married💍 | 21 | Mom of two under two and one on the way

So I've been trying to time my contractions. (Or BH) I start the timer every time I feel a period like cramp and stop it when it goes away. But looking at the times is confusing me..

Along with these I've been having stomach tightening after almost every one and have been feeling baby move like crazy.

Sorry for the dark screen