Kind of a stupid question.....

Kelly🌻 • Mom of two beautiful boys and a precious little girl, also I am married to my high school sweetheart! I love my life and God is so good!❤️

So I was five days late and I tested and I got all negatives and then on the 6th day still no period so I tested again and got positives, how do I know when I conceived? I don’t believe I’m more than 3 weeks because it would have shown up on my first day of my missed period right? I just don’t think Glow has my due date calculated right because it went off of the day of my last period. I don’t know if this even makes sense haha but could someone please help me!! Thank you!