Weird radiating feeling in back?

Samantha

So I’m 37+6 weeks today and since this morning I have this weird feeling in my lower back it’s not painful at all I’m still able to walk and do normal activities, but it’s just this weird feeling in my back I have never felt before it’s my lower back and hips it almost feels like a heaviness or radiating feeling. I’m trying my best to explain the feeling but it’s so hard I’ve also been losing bits and peices of mucus plug every time I go to the restroom as well. My dr appointment is tomorrow so I’ll ask my dr tomorrow what it could be but just in the mean time did anyone else feel like this? Is labor coming soon (i haven’t noticed any real contractions that are consistent enough to even time them or anything) so that’s why I’m confused if baby was laying on a nerve wouldn’t it be painful?