Brown + white mucus in 37 weeks 5 days

Hi, im currently 37 weeks 5 days pregnant. I just realised that i had brown + white mucus when i went to the toilet just now. Is this normal? Ive been having severe back pain which comes and goes since early this week but it intensifies recently. And also menses-like cramps which comes and goes as well. My next appt would be on my 39 weeks. Should i just go to the doctor and get it check?