Im 21 weeks pregnant and for the past three days i haven't felt my daughter move as much. should i be worried.? what can i do to feel her? do i goto doc?

Baby kicking: You should feel your baby's first movements, called "quickening, " between weeks 16 and 25 of your pregnancy. If this is your first pregnancy, you may not feel your baby move until closer to 25 weeks. By the second pregnancy, some women start to feel movements as early as 13 weeks. You're more likely to feel baby move when you're in a quiet position, either sitting or lying down.