16 weeks and not feeling anything.

Reece
I am a little over 16 weeks with my second child. I'm getting a little concerned because I am not feeling him moving. I always read that the more children you had, the earlier you would feel things. I know I have a posterior placenta, so I should really be feeling things. Friday I was feeling a lot of movement, but since then, it has been far and few between. Anyone else that is a 2nd time mom feeling things or not?