Left arm tingly numb and weak

Since the beginning of May, my left arm started giving me trouble. It would hurt bad when I move it a certain way. Almost as if it would dislocate. That lasted about 1 week.

Then I was able to move it more freely. However it would ALWAYS get weak after using my arm for a few minutes (I’m talking about 2-5min). It gets super tired ... well about a week ago, i started getting up multiple times in the middle of the night because my arm would go numb, I been noticing that my arms gets tingly within seconds no matter how I sleep. I should I say I’m 28 weeks pregnant so there’s no many positions I can sleep on expect on my sides. I have been sleeping on the opposite side of the arm but my arms still goes numb and tingly super fast.

I don’t know if pregnancy is related, I have sciatic pain as well.. anyway

Is this something I should worry? Talk to my OB? Or something I should talk to my primary care doctor??