Im 18 weeks with my 3 and i've been feeling my baby movements or flutters since 14 weeks.
With my first I never felt him move untill around 23-24 weeks, I started feeling with my second around 15 weeks, all depends on the baby really.. The baby may have very strong or very weak kicks. My mum never felt my little sister move as she was such a dink and didn't have a strong kick (untill you tried changing her nappy lol)
If you don't feel anything by your next appointment let the doc know.
My first I felt her around 18 weeks.
With this one I'm feeling baby roll around at 15/16 weeks
It depends on your body. How heavy you are, how far back your uterus is, etc