Totally normal po, lalo na kung first time mommy ka! Most moms don't feel movement until around 16-20 weeks, especially if it's your first pregnancy, kasi baby pa lang siya ng tiny at ang placenta ay nasa front pa, so mas mahirap ma-feel ang kicks. But if you're really worried or gusto mo lang sure, better check with your OB na lang para peace of mind mo, saka makikita mo rin baby mo sa ultrasound!