Pain mid back right side- almost like a pinched nerve?

Laura
Having random bouts of pain- especially towards end of the day when sitting, sometimes standing. Last night while sleeping-depending on how I moved, would have a sharp pain in this small spot as well. My latest theory is that attempting to sleep on my left side- is pulling my uterus and spine down and messing up my alignment possibly?! But I really have no clue. But it does not feel good. Def mid back just to the right of my spine- not lower or upper back. Anyone else experiencing this or have any suggestions? I hope to get to a chiropractor in the next couple of days, but I don't know if that's the answer! 
I walk close to daily and/or do prenatal yoga once or twice a week. Pretty conscious or sitting or standing for too long. Help!