So frustrated !!!!!

So I came off AF June 18 and I started using my ovulation sticks 6 days after I came off since I don't know exactly when to start using because I have an irregular period.. So I've been still using them because I haven't gotten my positive yet and on the June 29th it was the darkest line I've had yet to have even tho it was negative .. I thought I would get my positive soon after that but the line got lighter to no line and still is .. Has anyone had that happen to them ..  Ugh !!!!!!