Hey mama, totally normal yan! 4 months pa lang kasi kaya baka mabigat pa ang movements o nasa likod ng placenta pa ang baby mo kaya hindi mo na-feel clearly, a few of us first-time moms didn't really feel the kicks until 5-6 months pa. Ang tightening ng tummy (Braxton Hicks) ay normal din kahit ganitong stage, pero if you're worried or the hardening is painful, better check with your OB para peace of mind mo lang, okay?