Uy, I understand the worry kasi nakita mo na ang measurement, pero honestly, ang 0.67cm at ganyan ka-specific na gestational age ay really something to discuss in detail with your OB because they can interpret it properly against your baby's other markers at your specific situation. Maraming cases talaga na ang babies ay perfectly fine kahit may findings like this on ultrasound, pero it really depends on the full picture, kaya please don't stress too much muna, just schedule a follow-up with your doctor para ma-explain nila kung ano talaga ang significance nito for your baby at kung need ng additional monitoring or not. Hugs, mama, these moments are scary but you're doing the right thing getting checked regularly.