I felt bubs move for the first time at 16 weeks - but mind you this is bubs number 4, so i knew what to look for, and it took such a long time to feel it from the outside, DH didn't feel anything until about 28 weeks, i think he was just so little.

But once your bubs gets bigger, you wont stop feeling it...which is good, but also a pain during the night when all you want to do is sleep and they don't... The rolling and squirming can be so strong...lol

Don't stress, I had a scan because I felt less moevements, and as soon as the scan was being done, he wouldn't stay still, so i would say your bub is just too small, and in time you will feel it more and more...