Gestational age?? I’m confused

I just need a little bit of clarification. I went in for my ultrasound due to some bleeding and they only saw a gestational sack and my doctor was asking me if I knew for sure when my last period was(which do, nov 14)

At my ultrasound that would’ve made me six weeks and two days approximately. And I track my ovulation and I got my first positive ovulation on November 27th.

Can your gestational age be off also based off of ovulation? because he was thinking that I was more in the five week range. Because I know it can take a couple days for ovulation to occur once you get a positive test so what do I go off of for gestational age? And I got my first positive ovulation test on the 27th, another one on the 28th and The positive ovulation line was way darker on the 29th then the control line.

So which day do I go off of as far as ovulation? Because I essentially have three days of positive ovulation tests