Am I actually 5-6 weeks? Wasn’t sure how they calculate it.

I am not sure the exact but I know that I was ovulating the week of Oct 8th for sure( I had two apps tracking that were within two days of each other along with ovulation tests) but my last period was Sept 25. I have taken 2 tests and they are positive and my appt set up and all. I was just curious if I am actually 5 weeks or if that is incorrect. I’m still confused a little bit lol