Need help- Is something wrong

Ok so I'm 29 weeks 
For about a week now I've been having pain in my back I've assumed it was because of the way I've been sleeping sense that is when it seems to happen 
Today I been having this on and off back pain that would start in my lower back then to the middle along with a cramp feeling 
And around to my belly too... 
It doesn't hurt it is just very uncomfortable 
Now out of no where a few minutes ago I started to get this cramp feeling in my left leg
I'm a FTM so I am not familiar with any of this 
Any one knows what it could be what should I do ? 

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