Is baby ready!!! I am!!

Stephanie • I'm married and blessed with a two rainbow boys! A baby on the way & 3 babies in heaven.
Doctor says I'm 31 weeks and baby is 5 weeks larger then he/she should be. All day yesterday my tummy felt weird and tight. Today same feeling, but pink discharge possibly mucus plug? It's been coming out all day followed with painful cramps. Calling doctor tomorrow. What do you guys think?