Ovulation!!

Megha

Hi Ladies, I am testing my ovulation everyday one thing i dont understand is that when I test around 11am in the morning it shows faint line and app says you are nearly there start trying that gives me hope and I try testing in the evening also around 7pm, 9pm and that test shows no line. I am in my cycle 13. Is this possible to show no line if you test in the late evening. What is the best time to test, I don’t want to miss this opportunity that I ovulate and I think I don’t based on the test result. Appreciate your guidance.