rhythmic upper back pain

im 34 weeks & I've been having contractions a few days this week that seem to get a little more and more intense each time. I also keep having bad upper back pain that is rhythmic and doesn't get better when i change positions or anything else. it also goes all around to the front in my rib cage right under my boobs. I also get these cramps right under my abdomen and on the sides. my question is, is this normal for pregnancy or should I call or go in?