Sperm meets egg method

Curious about this method. Anyone tried it and got a BFP? Why do you need to have sex so early on starting from day 8 it’s not even realistic for the egg to survive I almost always get a peak on day 14-15.

I test with opks starting from day 10-11 and start babydance only when I see a “getting there” test line. I see no point of doing it so early on if you’re not as close to ovulation as you would the next day.