Help me out!!!

Katrina
I'm 31 weeks 3 days and I have been loosing my mucus plug the last few days a little at a time And now I'm dilated 2cm is this normal? 
This is my 2nd pregnancy but my first child is now 10 so it's been a while since I have went threw this whole thing. Should I be considered or no? I will be calling my doctor tomorrow.