Conception date wrong ?

Hi ladies ! So I’m currently 17 weeks & 3 days. It said I have been pregnant for 122 days. But when it said I got pregnant it was august 8th and that was 108 days ago. My first day of the last period was July 25th. So I’m confused if I got pregnant before august 8th ?? Or did I get PREGNANT ON AUGUST 8th. Idk if that makes sense I’m super confused. & 122 days ago was July 25th so am I pregnant before august 8 or ?? I got a negative pregnancy test august 14th then a positive one august 24th. My due date is may 1st so I just wanna know if I could have gotten pregnant before or after the 25th of July ugh 😭