Some people say to test twice a day, because your surge could be very short and may only have a 12 hour window, which only adds to
the anxiety. I would have liked to
, but it
was hard to
stomach the $30 for
You could still conceive naturally. OPK's are not effective on everyone. Most of the time, it is because you ovulate at times you least expect due to stress, anxiety, or life events as well as most women don't ovulate every month too.