question ladies!!

mary
I've been having contractions since yesterday. Yesterday they came with lots of back pain and were about six minutes apart also came with the abdominal uterus tightening. 
Now this morning i'm having contractions I'm not sure if they're Braxton Hicks but the tightening is what's happening with some back pain 
Here's a picture of how often what could this mean? 
I'm also worried if the tightening can harm the baby? 
I'm 40 weeks pregnant today. 

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