Aduh, jangan risau sangat dulu, mama! Ini memang perkara yang kena follow up dengan doctor je, femur length variation boleh jadi macam-macam reasons, dan doctor kena assess the full picture, bukan just one measurement saja. A few of my mum friends pun pernah dapat readings yang off, tapi alhamdulillah okay je babies diorang. Tapi honestly, you really should bring this up at your next checkup or even call your clinic sekarang je if you're worried, they can do another scan or explain properly what's happening. Better safe than sorry kan, especially at 36 weeks dah! Sending you lots of positive vibes. Let your doctor guide you through this, they know your full medical picture.