Confused??

Ha

Okay so I have a question.

I found out I am pregnant on 9/15 I took letrozole and had a trigger shot done on 9/2

The first day of my last period was 8/17

So if I go based off my last period it says I’m 6 weeks 6 days but if I go off of when I would have ovulated it says I’m only 5 weeks 5 days.

Which one do I go off of???