Pregnancy problems

Okay, so I have a bit of a dilemma. My calculations have me at 37 weeks but the doctors say I'm only 34. But with the measurements of my LO is that my calculations are accurate.

Now I can't tell whether or not im having contractions never felt them with my two previous children. It starts in my back and goes down into my thighs. My husband says he thinks within the next week ill have our third. Has anyone else endured this?

Also side note I literally spent the last 15 minutes peeing. Even after it felt like I emptied my bladder? Ideas?