Ay normal lang yan, mama! At 21 weeks, ang baby mo ay maliit pa kaya minsan nararamdaman mo lang siya sa lower abdomen or puso area depending kung saan positioned siya that day, lagi silang gumagalaw around naman. Pero since this is your first time feeling baby movements, better check with your OB just to confirm everything's good and they can show you exactly where baby is positioned para ma-ease your mind. Congrats sa pregnancy, at excited na kami for you!