Early Labor Signs at 37 wks

Patient: I am 37 weeks +2 pregnant, I had an OB appointment today but was only measured for belly. Last week I was 1cm dilated. 4 hrs ago, I started getting severe lower back pain, menstrual like cramps and frequent urination. I also have increased vaginal discharge (not bloody). Are these early signs of labor ? Should I head to the hospital?

Symptoms: Menstrual-like cramps, lower back pain, inner thigh and leg cramps, frequent urination, fetal movement.