Okay mom's to be I have a question, this is my second pregnancy I am 20 weeks and 6 days today and I…

Okay mom's to be I have a question, this is my second pregnancy I am 20 weeks and 6 days today and I lost a good bit of my mucus plug like a ton actually, I have been cramping in my back on and off for two days, should I be concerned? with my daughter I didn't feel any of my contractions in my stomach they were all in my back and I was induced, so I don't know what to expect with all of that. I know I am way to early to be going into labor & that a mucus plug can grow back but I never did this with my first so it kinda worries me.