I felt mine on 21 weeks exactly. I woke up that morning and rolled over and felt two little thumps. That's when I knew for sure it was baby and not gas lol.
You should feel the baby move really soon :)) I had the placenta in front with my first baby and she was kicking hard at 21 weeks :)
Anytime now:-) it also depends on placental placement too. If your placenta is in the front it'll act like a cushion, making it header to feel movement.