I can’t tell the difference

Natallia • 24 yrs married 14/1/17, been waiting 2 years and finally have our little boy 💙🥰

So this may sound silly but this is my first time being pregnant so I don’t know a lot about it... I’m struggling to tell the difference between contractions and the baby moving because it hurts when the baby moves anyway and it feels like my stomach is tightening so I don’t know if it’s just him moving or if I’m having contractions/braxton hicks... could anyone tell me how I will know the difference?