16 weeks, should i be feeling my baby move?

Im 16 weeks pregnant, and people keep saying because this is my 4th pregnancy i should be feeling movement now. And im not. I have a fetal doppler at home and listen to its heartbeat. I lost my little girl at 20 weeks pregnant last year, so im really scared this time. And this is making me more anxious as to why im not feeling it move around. Thank you in advance. x