31 weeks pregnant yesterday, baby has moved all day & i've been hurting all day, my back & his movements have hurt. usually active at night. is this norma?

Maybe not: A couple of points of concern 1) babies move on average about 30-40 times in an hour. This cycles during the course of the day, with babies at times going through sleep cycles. At 31 weeks, the fact you are having back pain is concerning--could be evidence of preterm labor ; 2) sustained use of Ibuprofen at 31 weeks can be problematic. In short, enough going on to discuss with your doctor asap.

Call the OB: You need to pick up the phone and call the OB service or go to the hospital. The symptoms you cite may mean premature labor and or fetal distress. A stress test may be in order ANS the sooner you go the better their chhance of stopping premature labor and or addressing other findings. Call now please !