Normal lang yan, mama! Usually first-time moms feel the baby movements around 18-25 weeks pa lang, kaya don't worry, bawat tao naman ang iba, at mas nakakaramdam yung mga second-time moms ng mas maagap kasi alam na nila ang feeling. A few of my mum friends didn't feel kicks until 20+ weeks and everything turned out fine, pero since this is your first and you want peace of mind, best pa rin i-mention sa OB mo during your next check-up para sure na all is well.