I didn't feel any movement until 20 weeks, and even then I wasn't sure. I'm 22w4d now and i definitely feel movement now! I was worried too. My bump still disappears when I lay down. I'm pretty sure its normal! You'll feel the little one soon enough!
I'm 19 wks 4 days. No movement for me either. Doc says my placenta is on top, so it'll take longer to feel her. Hoefully soon. I barely look preggo standing, sitting, or otherwise. Doc says baby looks good, so I'm not concerned.