Alah, jangan risau sayang, discrepancy tu memang biasa je, especially kalau cycle kamu irregular atau ovulation lambat sikit dari normal! Dokter swasta tu ukur based on baby's measurements (yang accurate), so 6w 5d tu lebih reliable daripada calculation dari first day of period; every baby develop differently timing-wise. Most penting yang heartbeat dah strong and everything looks good on scan, tu dah confirm babe tu healthy, alhamdulillah! Next check-up just verify the growth pattern okay ke tidak, tapi at this stage tu normal variation je.