Hi mama! Ang best person talaga to ask about those ultrasound measurements ay ang OB mo, kailangan niya tingnan ang actual numbers mo against the standard charts para sa 19 weeks, kasi bawat baby different ang growth naman. Don't worry too much, if may anything concerning, ang doctor mo agad sasabihin. A few of us moms ask the same thing, and the OB always explains kung normal or kung need ng follow-up ultrasound lang. Trust your doctor with this one, 'kay?