Sever back pain

Ugh I have sever back pain I'm not spitting nor have any abdominal bleeding but my back is super killing me should I worry about two weeks ago I pulled my back and went to the hospital and gave me Ativan at this point I didn't know I was pregnant but I'm in pain and I don't have a obgyn til August 11 anyone ha I g severe back pain and what do you do or what should I do should I worry