When to opk test?


I have regular cycles, but for some reason this last cycle I had went 32 days instead of 28.

I am currently on cycle day 3 of a new cycle now and I am wondering when to take the ovulation tests, because I’ve never done it before. This will be my first real month of keeping up with it & trying to conceive. Like I said, I’m normally on a 28 day cycle each time, so which days do you suggest taking my ovulation tests? I have a pack of 10 so I can buy more if I need to! Thank ya :))