I started feeling movement at 17 weeks I don't feel them often but more kids you have the sooner you feel ! There is a spot on my stomach feels like a hard ball but you pbly won't feel foot of limbs till baby is bigger
Odds are, it's probably just your uterus in a funky position because baby is in a different position. I am just starting to feel movement, but it is still so early on that it only feels like a little tickle or a gas bubble, definitely not very distinguishable yet, but I am sure it is to come :)
At about 16 weeks, baby's hands/feet are only about the size of one of your fingernails, so it's probably not a foot/limb, but could be your shifting insides! I'm 17 weeks & I can feel absolutely everything shifting!! Lol