Cramps and discharge

Kimberly
I am 27 weeks 4 days. Last night I had cramping very low but thought I had just over done it through out the day. Now today I just had a big glob of white/yellow thick discharge. In my first 2 pregnancies I only had these things closer to my due date. Is this something I should be concerned about?  I have a dr apt tomorrow and was going to just ask then.