31 weeks lower belly pain!?

I feel like everyone is having such great pregnancy’s then here I am having every possible pain It seems! My lower belly has been super crampy my doctor didn’t say much about it so I’m guessing it may be normal? I’m at a loss at this point on what’s normal or not this pregnancy lol side note I work 30-35 hours a week on my feet all day so I guess that could add to it