Upper back pain. Helpppp

Every so often I’ve been having upper back pain. But today I’m almost in tears and I don’t know what to do or what’s causing it. First off, I’m 29 weeks pregnant & let’s just say this pregnancy has been anything but easy on my body. But nothing I couldn’t handle.

This pain starts on the upper right hand side of my back (like behind my shoulder blade) and radiates to the top middle and then the actual middle of my back. I can feel it in my chest and it hurts. I have to take deep breaths the whole time it’s happening and it helps a little. It lasts for up to 5 minutes but then will go away for a few hours.

Anybody experience anything like this ? What should I do ? My Obgyn is closed for the day.