My last period date was on July 14 after that I had intercourse on only one day at August 5 then my next period date was August 15.but I don't know sure that I had get perriod .but I have a doubt also I get period.after that I missed period in September and October but September 7 onwards I had intercourse continued many days.but September 29 pregnancy test at hospital show negative at urine and blood.but October 28 pregnancy show positive and ultrasound show 7 week 2 day at October 28.and due on June 13 2021.

Pls help when did actually get pregnant