Girls, hello! I'm 37 weeks pregnant. My belly is rock-hard and feels l…

Girls, hello! I'm 37 weeks pregnant. My belly is rock-hard and feels like it's pulling, sometimes I feel pain from below. What could this be? Could it be training?? My mother-in-law says that during contractions, her back and belly hurt too, and with her first child she had a miscarriage, roughly like menstrual cramps but very strong. Will the contractions also be painful?