Sadly, it is possible. You may have started an LH surge which the OPK picked up with the positive but your body backed off for some reason and you didn't actually O. Stress can cause it to happen and you will often O later in your
cycle - I would continue to BD every other day and keep temping and see what happens. This could also just be a fluke month where you will not O for some reason - that happens too.
Because this is your first cycle keep it up and see how it goes. If you don't get an O this month, temp again next month - if still nothing then change your thermometer, just in case you got a bad one. If still nothing, talk to your
dr.
The good news is if you really aren't O-ing then you are not wasting 6-12 months before you find out when your dr will finally test you to see what is going on.
*HUGS*