I'm probably paranoid but...

Shadoe • Mommy to a free spirited little lady & pregnant with our little fella.
This is my third pregnancy, I've had two second trimester births & now one living child so I'm a little on edge as is. I started feeling the baby move around 19 weeks & others could feel him on the outside too. He was super active. I'm now 21+4 and for the past two days I may feel one kick. Is this normal? I went into labor with both my previous babies at 24 & 25 weeks so as it nears I'm panicking. When should I start counting kicks?