Ovulation test questions!

So this is my first ovulation cycle since my miscarriage. I wouldn’t say we are trying to get pregnant-I was more wondering when to expect things to go back into a cycle so I decided to track. (However we would be excited if we did get pregnant first cycle out!) My question is how can I have 3+ days of positive tests? I thought it was 24 hours of positives and then you ovulate? Also is it still considered a positive if he test line is stronger than the control line? I’ll post the positive/negative photo in the comments. Thanks!