ovulation test question

Khadijah
Is it possible to have a positive lh surge and then 6 hours later have a negative??
Here is the rundown of my obsessive testing
Thursday 4pm 4 positive ovulation tests
Thursday 10pm 2 positive ovulation tests 
Friday 2pm 2 positive ovulation tests 
Friday 9pm 2 positive ovulation tests
Today 3pm 1 positive ovulation test
Today 10pm 1 NEGATIVE ovulation test
I was beginning to worry something was wrong with my body because of how long my lh surge was positive so right now I'm very happy it's negative, I'm hoping that means I released an egg or something. 
So my question is if somebody could please explain to me what exactly is happening?!?!