early labor? advice

Any Mommas out there that can give me some insight? I'm about 37.5 weeks. Was 3cm dilated and 50-60% thinned out at last weeks appointment. I've been having more frequent Braxton hicks the past few days. I lost what I thought was my mucus plug on Thursday. No blood tinge to it, it was strictly yellow and goopy but a ton. Little more lost on Friday and Saturday. Today I woke up and have been very crampy since about 10/11am. Braxton hicks started this morning but have tapered off quite a bit. Back pain is painful (but not to the point I'm crying) more of an uncomfortable and aching feeling. when baby moves I have worse back pain however. The period like cramping doesn't seem timeable but achy in waves. Early labor possibly or worth getting checked out?