Back pain that comes and goes

I'm a FTM, 36 weeks on Wednesday. All day today I had back and hip pain on my right side. I chalked it up to sleeping weird. I took a bath earlier, it seemed to help a bit. About 2 to 3 hours ago, it started to get worse. The pain would come and go, was occasionally paired with cramping pain in the front and at the top of my thighs, tightening of my abdomen but not every time. I took a 45 minute nap and everything seems to be fine now.

I'm going to let my doctor know at my next appointment. Anyone have any insight as to what may have caused it? Contractions? Just really bad braxton hicks? Me being a wimp? 😂