Ovulation help please.

Kealeigh
According to an app that I follow I should've ovulated on the 10th June, however I didn't take an ovulation test until the 11th which was quite clearly a negative test.
 My question is IF i ovulated on the 10th the test would've been a dark positive however since I didn't test til the 11th and there was absolutely no line does this mean there is a possibility I didn't ovulate the day before or does the LH disappear within hours after ovulation so since it was a day later there would b no line st all? 
Hope this makes sense to someone! 

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