Should i go to urgent care after work?

Please dont say if it's what I want to do. Like if you were feeling this would you go? Okay so I'm 31 weeks pregnant with my first and I'm 18. But today my back has been KILLING me (middle of spine on down and probably from working) and it comes then fades then comes again. Also the top of my stomach will start to hurt and then I get pressure in my lower abdominal area (cervix area) then when it stops i feel my son moving. Then it starts again. My doctor said if i have consitant back pain it could be an infection or something. I dont know what braxton hicks feels like or anything.