36 weeks.. what’s going on?

Just wondering if anyone has had these same symptoms. I’m 36 weeks pregnant and for the past 2 days I’ve been having period-like cramping. It’s pretty low, at the bottom/under my belly. It feels like a period. I’ve been having pretty bad lower back pain, I can’t sit, stand, or lay down comfortably at all. The lower back pain kind of radiates around my hips and I get shooting pains down the front of my legs. It seems to all be worse when I’m laying down. Also, baby HAS been moving, and making kick counts, but is less active than she normally is. I’ve also been having an on and off headache and dizziness (blood pressure looks great though, it’s actually been slightly lower than since I got pregnant).

Does anyone know this? Has anyone felt this stuff before and how did it turn out for you? I have a routine doctors appointment this afternoon and will definitely be discussing this, just wanted some personal experiences/opinions!