Hala, totally normal yan mama! A few of us first-time moms worried the same thing at 18 weeks, some bumps show later talaga, especially kung first baby, and it also depends sa body type mo and kung how you carry. The important thing is ang ultrasound mo showing baby's healthy, so don't stress too much about the size ng bump, some moms show more, some show less, but baby's doing great pa rin! Excited na rin kami to know baby's gender hehe, congrats ulit mama!