I need your opinions

I found out on Friday that I am pregnant. According to Glow I'm jut at 5 weeks. I took two digital tests and one regular. The regular test immediately showed positive, even before the control line came up and the positive line was very dark. My sister, who already has two kids, said that I am probably further along than 5 weeks because of how fast and dark the line showed up. What are your opinions? My first OB appointment is scheduled for the August 19th but I am dying to know how far along I really am because my last period was kind of suspicious to begin with. Thanks!