Worried about fetal movement

Hello, momshies! I’m a bit worried lang about my baby. Is it normal po na minsan hindi ko maramdaman yung galaw ni baby? I’m 21weeks pregnant po. Nung 19-20weeks, super active niya. And now parang hndi na siya masyadong gumagalaw. Okay lang po kaya yun? Or something happened na with my baby? Please enlighten me po. Thank you!