What do contractions feel like?

Jess • Been with the love of my love for almost 8 years, married 17/08/19 baby boy 💙 👶 05/10/2019 baby boy 💙👶 April 2022 baby girl 🩷🧒 March 2024

As a first time Mum just asking what do contractions feel like? I woke up in the middle of the night with back pain, my stomach was hard & tight. I got up moved around sat up now I’m not feeling it so I’m assuming could have been braxton hicks?