Rainbow baby!

I’m trying to figure out how far along I am with our rainbow baby. We have a two year old and then lost our second baby this August at around 7 weeks. My last period was October 28th- November 1st. Through 3 different tracking methods I found that I had high fertility on November 11th and 12th with peak fertility on the 13th. Then I took a pregnancy test on the 23rd and it was negative and got my first positive test on the 24th. Do I count from the day of peak fertility? That would make me 1 week and 4 days when I got my positive on the 24th. Can you actually get a positive that early?