Measuring 2 weeks ahead at 36 weeks

Had an appointment with my Dr today and she said I’m measuring about 2 weeks ahead. She keeps saying it’s probably a giant 9-10 pound baby and it’s instilling so much fear in me. She’s sending me for an ultrasound at 38 weeks, where she’ll be on holidays and then at 39 weeks is when I would see her next. I’m so terrified of the thought of having that big of a baby as it’s my first. Her constantly saying giant baby is not at all reassuring. It just doesn’t seem like she really intends to do much about it if that happens to be the case. Meanwhile I’m a hot mess over the whole thing feeling completely overwhelmed. Anyone measure ahead and not have a big baby?