Back Pain!!!!!

I'm 35 about to go on 36 weeks pregnant... I've been having the worst back pain near my tailbone. I couldn't eat dinner and I sat just for a while. I'd like to think I have a pretty high pain tolerance but this is insane... It knocks the wind out of me. Is this what majority of you experienced? Should I go to the hospital? My next appointment is on Wednesday. Should I wait it out.