When you trigger how do you count the days past ovulation?

Le

This has always confused me with my <a href="https://glowing.com/glow-fertility-program">iui</a> cycles.

When you take a trigger shot how do you know how many days past ovulation you are?

Because 12-36 hours trigger shot will work we don’t know exactly when are body releases the eggs.

Need some answers and opinions. If I triggered Wednesday evening at 7 by Friday should be ovulation or would it be Thursday?!