Ay sis, normal lang yan lalo na second pregnancy mo pa! Sa first ko I felt movements around 18-19 weeks, pero sa second ko parang 20 weeks na talaga bago ko distinct na nafeel, honestly basta nakikita ko sa ultrasound na okay ang baby, hindi ako nag-alala. Your body at size ay personal, so don't compare sa ibang pregnant mums, marami rin kaming konti-konting tiyan kahit advanced na weeks. Pero if worried ka talaga, definitely check with your OB sa next visit mo, they'll do the ultrasound and confirm everything's progressing well, and that'll give you peace of mind na!