Yes! That's how they start, it feels like their poking you with their finger when its their little tiny foot
Its definitely baby!! I also felt pokes or kicks. I'm a ftm and 18+3. I never felt flutters. Its an amazing feeling to feel my baby in there! (=
Its quite possible that it is movement, I only felt flutters twice and then it was on to pokes and jabs. If it isn't it could be your muscles contracting and growing.
It sounds like its your baby I'm 18w 1d and have had movement for weeks and sometimes it feels like pokes so I would say its most likely your lil one :) congrats :)