What does first movements 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

I’m 21 weeks I think I felt my baby’s first movements I’m not sure though. It felt like a flutter I’m not sure it’s hard to explain.