Ovulation

Hey looking for some advise been tracking ovulating since early June 18 when I had my rod removed, I test with clear blue digital and I normally ovulate between day 15&17 so I was meant to ovulate on the 5th jan, I’ve been testing since the 3rd jan when we came away from a trip but no sign of it what so ever no where near close with two lines any advise would be greatly appreciated ❤️