Ovulation question?

Marilu. • 33 years old. Expecting #4. Its a boy!!!!!
I started testing for ovulation on Tuesday. CD 16. I got a barely positive. CD 17 pink line super dark so positive. CD 18 positive and dark as well. Today CD 19 again very dark. How many positives I'm supposed to get? U read the fertile window can be up to 6 days but does that mean I will be seeing polite all the way? Please advice!