LH Surge...

Elizabeth • BFP on 4/10/17 for baby #2 ❤️ [Baby #1 = Jan 2016]
Is it possible to miss the LH surge? I'm getting nervous bc according to the app (which I realize is an estimate) I am at peak ovulation tomorrow and haven't detected it yet. I don't want to mess up this cycle...as you all know time is precious. ☺️ any words of advice welcome!