This is my first pg and I felt bub move when I was around 15-16 weeks, DP felt him move at about 18 weeks, family felt him kick when I was 20 weeks It started off that he was only active in the late afternoon, but now he is active most of the day.
I agree its all about timing. Most of the time bubs only kicks when Im by myself and when someone eventually goes to feel him, he will stop lol