OPK Question?!? Help :)

Is it possible have opks positive in the morning but not in the afternoon? Here's mine:
Cd 9 AM: Positive
CD 9 PM: Negative
CD 10 AM: Positive
CD 10 PM: Negative
CD 11 AM: Positive
CD 11 PM: Negative
CD 12 PM: Negative 
Is that normal? Now at 6dpo but wondering if I ever actually ovulated :/?