No movement

I'm 20 wks 3 days and I haven't felt anything. My last ultrasound was 16 wks and 3 days and everything looked good. I haven't had any spotting or pain besides what feels like the occasionally ligament stretching. I am very over weight so I was thinking that may be the case but when I googled it says overweight mamas still have the same nerve endings in their uterine wall and baby should be felt internally but difficult to feel externally due to the extra weight. My anatomy scan is next week and it can't get here soon enough because I'm scared that the baby isn't moving in there. Does anyone else have this issue?