Possible preterm labor?

I'm a ftm 33 weeks today. I have been having really bad front and back pressure in my pelvis, menstrual type pains that are not constant as of now but have gotten worse the past couple of days, and terrible insomnia last night. My Braxton Hicks contractions are getting more frequent but it's hard to tell if they are coming at regular intervals. I have an appoinment with my doctor tomorrow but was wondering if other women experienced this just before going into labor or could it be early labor? I am high risk because of Crohn's disease and blood pressure issues. I know all these can be normal symptoms during the 3rd trimester but it seems strange to have them start all at once. I've also got a cold a couple days ago and have been feeling nauseous. I don't usually get colds even during the winter and I never had morning sickness. Any advice would help as I tend to worry and always think of the worst.