Hai sayang, I understand you're worried! CRL measurements can vary between babies and different ultrasound machines, so small differences are usually okay, tapi jangan worry sendiri, please check with your doctor asap to confirm your dates and baby's growth. The most important thing is that a medical professional look at the whole picture, not just the measurement number. One of my mum friends had the same thing and her doc just adjusted the dates, baby perfectly fine. Your doctor will know best, okay? Take care!