Eh, I know how scary that feels! A few of my mum friends juga kenaситация macam ni, one of them baby dia terukur small at 37 weeks, but doctor said growth rate okay lang, just naturally petite baby. Yang penting is memang follow up dengan doctor regularly, buat sure baby's growth trajectory is normal dan placenta function okay, because sometimes small doesn't mean problem, tapi kadang ada reason yang kena check. Mana check-up you next? Maybe ask your OB to explain the exact measurements and what they're monitoring, usually they tengok amniotic fluid level, blood flow, semua tu, so jangan worry sendiri je lagi.