Talk to Gynecologist on Baby Movements

Hi This is my first pregnancy and I’m in week 21 now, (Masha’Allah) since last week I’ve started feeling movements but some days the movements are more other days i feel less movements like today the movements are very less, I’ve been keeping a check since morning. Is this normal? Can someone pls tell what am I supposed to expect from these upcoming days regarding movements? What’s normal and what’s not, I’m very confused. Thankyou.