I felt rolling flutters within the first few months but by the time i was 20weeks and up i felt kicks and shifts. Im 27 weeks now. And i feel like a punching bag. U should definatly make a dr appt and tell them u feel no movement.
With my first I didn't feel her until 15 weeks. But even then it was only here and there. At 20 weeks she completely disappeared for a couple days and I felt nothing. At this point they are still so tiny that they can hide in places you wont be able to feel them. A lot also depends on how you are carrying, how tight your abdominals are and how long your torso is.
I am 21 weeks also and am just begining to feel my little girl moving. I was/am bit worried cuz so many others started feeling theirs weeks before but now that I'm feeling her more often my worries are slowly sliding away. I try to reassure myself that she's just sleeping a lot & will do the same on the outside.
I started feeling flutters at 15w but nothing big until 20w. Then around 23 to 24 w I could see my belly move.