Due Tomorrow!!!

Sarah
I'm not getting my hopes up, but I have been getting intense "contractions" (not sure if that's what I'm having, my stomach and back get really tight and hurt" since 6:45, they have been about an hour apart each time and lasting maybe 30/35 seconds (haven't really timed them) could this mean anything or is it just Braxton Hicks? 
The last one I had came about 45/50 minutes from the one before it... I'm a first time mom and just wondering when I should start timing them or if it's nothing to even worry about. 
Any advise would be amazing!
Thank you in advance.