Sooo question!!

Summer • In love with my best friend❤️ mommy to a beautiful 2 year old baby girl Anastasia Reneè🌸 and a handsome 2 month baby boy Anderson Raylen🏈

My last period was august 29th I took a positive opk on the 10th of September so I assumed I ovulated the 11th my question is I've been getting positive faint lines since 5/6 dpo so today in 9dpo and got a good line but most things on the internet says I don't implant until 9dpo how was I getting positives before then?? And when is my EDD?? Thanks ladies