mild pain/discomfort at top of bump?

I'm 41 weeks today and I've been having mild pain in the top of my bump for a few days now, but it's become most noticeable today. It seems to happen whenever I've been sitting in a slouch or laying down for too long because I get a lot of pain when I sit up as things settle into place. The problem is I barely got any sleep last night and I've been increasingly tired over the past few days, so sitting up is too much effort.