Angela... If you continue to take you temp daily you will see a sudden decrease in temp that is considered the Lh surge and then is when you start bding if you haven't started already. Once you temp starting to increase there should be 3 days of steady increase to confirm that you o. Remember you can get a pos opk and still not O and then O again later in the cycle....Yeh I know our body is crazy like that. So if you are skeptical about opks just keep doing both as a back up plan. One has to be correct.