can i go on strike or something like that until i receive my shift manager raise

Hello so I have been working at Taco Bell since the beginning of March & about June I accepted a position raise of shift manager because the night shift manager was pregnant and she was going to leave. I didn't sign any paper work Nov. 20 which included a pay raise , I noticed as I was working my paper work stood in the office for about 2 or 3 weeks. I was furious. Now its not there & I still haven't received my pay raise although I have been doing the work by myself basically since I signed the paper work. I am pregnant & I have a lot of bills that need attention but due to my financial situation I cannot do so, so the raise would really help my life right now . please give me any advice you can & I am willing to hire a lawyer for this situation if necessary . thank you for your time .