Tracey .. laddies Help Please ???

ok I started my cycle AF on July 22 IT ended 26 ... I started my ovulation test on 26 soon as AF ended .. and been test up until today still no Positive just yet when do you guys think I should be ovulating .. GLOW say the 29-august4 but ovia App say I start my fertile window on Augusy 3-8 help my cycles are 28-29 days long could I be testing to early .last month my ovulation test was positive like 6 days after AF ??​