Maybe Braxton Hicks?

First time mum here, 20 + 1 today, last few days on and off my tummy has gotten really tight and lasts about 10-15 seconds then loosens up, today it happened this morning but now it’s happening every 5-10 minutes it’s not painful but it is very uncomfortable and I feel like I am winded when it happens. I’ve drank lots of water and I’ve lay on my left side and tried to relax but it keeps happening and I’m starting to really worry that it’s not Braxton Hicks and my body is prepping for early labour. Does this sound like BH? I’ve never experienced it before so I’ve no idea what to look for. It’s not sore it’s just very very tight I can feel my uterus get tight.