What are the signs of labor?

I’m having my second child I’m due may 14th. I’m 32 weeks today (3/19/22) and I noticed I lost some of my mucus plug TMI but Thursday and Friday I had soft stools and feeling nauseous which I haven’t felt since the beginning with some lower back pains, any ideas? I haven’t even set up any baby things I was waiting till I was a little further along but should I start now? I had my daughter at 38 weeks and was dilating a cm for 3 weeks so kinda worries me about this pregnancy