How far along am I?

Does anyone else have a doctor that calculates from the IUI date? I ovulated on day 11 of my cycle (w/ ultrasound verification) and did and iui then. But my doctor has said specifically we are starting the count from the IUI date, not my period date. Is this normal? I’m having such a hard time with apps bc they won’t let me use my iui date.

My last period was Jan 13th

IuI was Jan 23rd