What is this???

Kylie
My mom and I walked yesterday for half an hour really fast paced. I know this isn't long. For about a week now I've been losing my mucous plug. All evening and night up to now still I've been having bad back and front cramping is this the start of something??? I'm 40+1 and excited and nervous and scared all at the same time. I have a doctor appointment today and really nervous I'm still not dilated or effaced. If this is a tiny bit of what labor feels like thank hid for epidurals. I really wanted to go natural but idk if the pain gets any worse than this. Please give me your thoughts!!!