Normal yan, mama! At 21 weeks, ang galaw ng baby ay still unpredictable, minsan active, minsan parang tulog lang, lalo na kung busy ka kaya hindi mo gaano napapansin. Ang pattern niya sa activity ay magbabago pa ng maraming beses hanggang sa delivery, so walang need mag-worry pa ngayon. That said, once you reach around 28 weeks, it's good to start monitoring kicks more regularly, para sa peace of mind mo, best to bring this up with your OB sa next checkup, lalo na kung may sudden changes na napapansin mo later on. For now, enjoy the kicks when you feel them!