Totally normal yan, mama! First time moms usually feel movements around 18-20 weeks pa lang, especially kung hindi ka pa masyadong familiar sa feeling, one of my friends didn't feel her baby move until 21 weeks and she was super worried din. Every pregnancy and every mom is different, kaya wag ka mag-alala ngayon, basta regular ka lang sa prenatal check-ups mo para makita ng doctor kung okay ang baby. Ikaw talaga ang mag-reassure sa sarili mo soon, promise!