So i have a question just like anybody else

🌺Melissa🌺 • Mom of 2 lil girls; expecting #3 10/2015
And I'm asking experts on this, I counted back from today to the 29 of Jan I'm 7 weeks today, so that would make Jan 29 1 week pregnant right?! I've never done this with my last two pregnancies. So does that mean I got pregnant exactly on my fertile week which was 19-25 of Jan?? Thanks ladies!