I am nearly 28 weeks and I will have days when bub is going crazy, other days when it's a bit quiet. My OB said that until 30 weeks they don't even really bother with kick counting because the baby is still of a size that you won't necessarily feel all the movements. I've had scans (I have them every week to check for heart issues) where you can see the baby moving but I wasn't feeling it. It also depends on bub's position - it may be kicking backwards and you aren't feeling it. But even that aside, 10-15 movements still sounds pretty good to me.

BUT if you are concerned always trust your instinct - it isn't worth the stress for you to be worried about it all the time. So if you are really worried, then get more advice. Good luck