Ovulation help

Hello

I have a very important question:

I use “clearblue ovulation test” that pinpoints my two most fertile days every month.

My questions is: this month I got my first smiley CD15 (had sex that night), and the following night (ovulation). I was taking clomid this month, and injection called Diclair that day I got the smiley.

Just for fun I continued testing every morning the two following days and still got a smiley.

I have read on google and the instruction, that it’s only the first smiley that counts, so I should stop testing after my first smiley, and will ovulated approximately 12-36 hours after that.

Is that true?

Thank you