Alah, confusing kan dating pregnancy ni! Honestly, go with what the scan shows (5w6d) sebab ultrasound tu lebih accurate dapat tengok kantung, especially kalau doc buat transvaginal scan, that's the clearer picture, bukan rely on LMP saja which bisa off by a week or two depending on cycle length kita. Masa nanti follow-up, just mention both dates to your doc and let them decide which one to use for your medical records, but antara you and your gynae, ultrasound dating is what matters most lah.