Ovulation question

Stacy B👶🏼 • Pregnant with my second - due early May 2016
Ok so I've read that ovulation happens 12-24 hours after the surge. So if I'm doing opk every morning and not getting a positive, is there a chance I'm missing my window? Shouldn't I be testing 2-3x/day in my fertile week? 
Example: test negative in the morning, and have a surge in the afternoon (with out knowing), and then the next morning/ 24 hours later test again (on schedule) and its negative. So with out knowing it I've missed my window