Dont worry too much.
With DS i was feeling kicks, even DH felt the kicks, at 16 weeks 5 days.
This pregnancy i didnt even get flutters until at least 19 weeks 5 days and proper kicks until about 23 weeks where DH was able to feel them.
I since discovered my placenta is anterior, which may affect feeling them a little, but have absoluely no problems now.
Im sure everythings ok hun.. and dont worry, its very common.