Chiropractor

I have been having bad back pain for weeks now. I think I did something to it from all the coughing and puking I did in my first trimester. My OB gave me some exercises to try and help but it's not, the pain is getting worse. He said it was safe to go to the Chiropractor if I thought it would help, but I'm nervous to! I'm afraid of tensing up while being worked on and making the problem worse!