Numb...help

Jessi • Pregnant with baby #2! We're having a boy and beyond excited! I'm not thrilled that we are in alaska tho. From California and I hate the cold.
Ok idk what is going on but my left arm keeps randomly going numb between my shoulder and my elbow then it starts to hurt really really bad then it goes numb again. My husband is at work and I'm home with my 3yr old. I haven't lifted anything with my arm yet today. My hand or arm is not swollen. Is it just a weird thing happening today or should I call my doc and ask them about it? I have no way to get to the doc today so I would be screwed if they wanted me to come in.