Hey-- yes, you will definitely know when you're getting kicks, but no one really knows when they will get them. They give you a time period of when "most" people get them, but with myself and my pregnancy, I did not start feeling movement until around 24 weeks! Still now, I go days without feeling much movement and then there will be days where she moves all the time. Everyone is different, so if your 20-week mark comes, don't get upset if you haven't felt anything, that's perfectly normal!