Braxton hicks

Zee
Not Sure what to do? I'm 34 weeks an since last night I been having sharp pain an mild cramping with some back pain. No blood or water breaking, so I'm guessing either the baby is changing positions cuz he was moving a lot last night or they are just Braxton hicks. At times I couldn't even move to my left side cuz it would hurt so bad an same for my right. My mom thinks maybe my body is preparing it self or the baby dropped? Should I call my ob?