Lost some of my mucus plug at 30 weeks today

Nicole • Have a beautiful 1.5 year old boy 👶🏻 February 6th 2018👼🏻 . Twin boys due April/may 2019🌈🌈

TMI so I lost some of my mucus plug this morning and I've been cramping in my lower back but not contracting much. Should I call my dr or am I good. I've already been in hospital on and off for constant hard contractions ( no dilating tho)