Due dates.

This is pretty stupid but bare with me. So originally I was given the due date of January 16, 2016. At one of my doctor appointments, I measured a bit smaller than last time. So I was given an ultrasound and apparently measured three days bigger. So my question, would you still say my due due date is the 16th or the 13th? I know it isn't a difference, I'm just impatient and I want to meet my baby already.😩