FTM help- what do braxton hick feel like?

Willow • mother-sister-wife-daughter 🌸

This last week my husband and I have been going on longer walks together. When I'm walking- maybe 10 or 15 minutes into the walk- my stomach gets really hard and there is a cramping that usually makes me stop and breathe it out. It doesn't feel like period cramping but more of a tightness where if I keep walking my skin is going to tear. Is this tightness braxton hicks contractions or just my abdominal muscles tightening?

Thanks!