21 weeks and still don't feel the baby move at all. should I be worried?
you'll feel baby sooner or later. it's common for some women to feel early on, especially if they've been pregnant before with a baby. but I didn't feel my son move or kick until I was 25 weeks pregnant. every woman is different, ya know? and where your placenta is located also plays a roll. mine is anterior in the front so that had a lot to do with not feeling him at all.
Between 16-25 weeks is when you start feeling baby. You still have a month to give baby time to move for you.