Quoting AshleyJenn:" Ummm yeah no difference.. "A normal full term pregnancy can be measured anywhere from 37 to 42 weeks ... [snip!] ... will do a little better than 37 weeks for the most part. But it's not up to you or someone else...baby will come when ready."
A due date can be off by 2 weeks. So what if that 37 week baby is actually only 35 weeks. That is why they call it term and not Full term. Full term at 40 weeks could mean that baby is only 38 weeks which is a much safer zone for that infant.
But even at that. The baby will come when THEY are ready. You're not pregnant forever.