Third Trimester Cramping

CMJ • Full time mommy to Reislyn & Laikyn.
Is anyone else experiencing cramping in the third trimester? I'm 31 weeks and for the past couple of days have been having constant period like cramps. I have an appointment to see my doctor tomorrow, just wondering if anyone else is or has gone through this before?? I've noticed a few BH, but I've been having those for weeks.