Dating gestation

my lmp was June 13th-16th. my ovulation was supposed to be at the end of the month of june. fiancé and i had lots of sex right after my period and during my fertile week. started experiencing pregnancy symptoms towards the end of my fertile week. took a test on july 3rd when i was supposed to “ovulate” the 5th according to glow (was taking opks and all were negative causing my ovulation date to be pushed back). got a positive. a pretty dark positive. my question is, when i took a test and put it in glow. it said i was 2 weeks and 6 days. i know you’re not technically pregnant at two weeks sooooo how did i get such a strong positive when i was only technically 6 days pregnant 🤣