Confused

Kayla

I’m pregnant and I got my pregnancy confirmed after 4 positive test by my doctor on Friday the 18th. My last period was September 16,2019 and my next one is supposed to be October 22,2019 and I have a 36 day cycle so how far along am I? My doctor said I should be around 4 weeks to a month and I calculated it today and it says I’m 5 weeks soooooo how far along am I?