Tightening , nausea and barely can walk

Hi mummies, is it normal to feel tummy tightening every 10 minutes at 31 weeks? I'm not sure if it's Braxton Hicks. My tummy gets hard and then relaxes, and it's been happening quite regularly. Did anyone experience this around 31 weeks? Should I monitor it at home or get checked? Thanks in advance 🙏🏻