contractions or braxton hicks

Niesha
Been having tightenings all day since this morning across the top of my belly (top of bump) 
Now feeling a slight crampy feeling at the bottom kind of life period cramp but belly still getting pretty hard 
No pain tho just uncomfortable 
What is this I'm never had braxton hicks so don't know but online says contractions start at the top of ur belly 
Also no pain in back 
Btw I'm 37+2