Measuring " 3 weeks ahead" but no GD

I had a growth scan today (34 weeks) and I'm off the chart 🙈 I don't have gestational diabetes so the likelihood is I'm just having a "big baby" (Daddy is 6"7!) does this mean I'll likely be early? Need intervention or even a c section? I don't really understand what it might mean for me in terms of my delivery. The doctor just said he's big and we'll see how I go for the next few weeks but when baby runs out of room we'll know about it!