What movement?

I'm 19w4d, and not really feeling movement. This is my 3rd baby that I've carried this far, 6th pregnancy. At 16 weeks, I was feeling a lot of baby moving around. But for about a week, nothing. No rolling, kicking or anything... the only thing I do feel is popping sensations, which can be attributed to my extreme gas. I'm kind of afraid. After sex with my hubby, my uterus would be really hard and jutting out, now there's nothing. I don't know... am I just over thinking? I seem to remember feeling more at this stage... let me know guys