Decreased movement

Hello mga mosh! Na feel ko movement nya 18 weeks, then nung 20 weeks araw araw maya’t maya ko na po sya nararamdaman, tapos nung nag 20weeks and 3days (kahapon) di ko na po sya masyadong maramdaman hanggang ngayon. Should I call my OB na? Or is it normal for a 20weeks and 4days to not feel the movement regularly? Ps. Wala naman ako cramps and spotting #1stimemom #pregnancy