confusing opk tests

lindsey • Currently ttc my secound child. 25 years old from england with my partner for 12 years and have a 4year old daughter x
ok so according to this my fertility window started monday.Iv bin doing ovulation tests each day but they all seem negative to me one weds was darker than all the rest iv done but they all are faint and are getting fainter . What does this mean im new to all this? With my 1st dd i just came of bc and let things happen naturally we wernt actively ttc just not taking precautions and it took around 9months as my partner works away. Appreciate any help?