Severe back pain

Ha
I'm almost 19 weeks, first pregnancy. I've had back pain frequently throughout my pregnancy so far, but it was never anything a warm bath or relaxing couldn't fix. 
This new pain started last night, along with hip pain. I just associated it with the uncomfortable chairs at my mid-pregnancy class yesterday and a long day at work. Well today its continued and worsened. I worked again today but pushed through it because I needed to. 
I got home and laid down in bed for about 30 mins or so, went to get up and start doing some things around the house. And I could barely walk! My lower back and hips are so incredibly tight that I can only take small, slow steps. Should I be concerned enough to schedule an earlier apt with my midwife? My next apt isn't until Oct 5th. I have an ultrasound on the 15th this month but I'll only be seeing the radiology department and an ultrasound tech.