Random question

So I know that once you get a positive ovulation test that you have 24-36 hours to do the BD however my question is does that clock start ticking at the moment you take the test? I took a test about 830 this morning and it was positive so does that mean from this morning till tomorrow night I need to do the BD 2x? Because then I think maybe I had my surge in the middle of the night and at 830 when I tested is when it showed up so do I have an even shorter window if I should count from the middle of the night? Do you see what I'm saying, I hope I'm making sense lol 👍🏼