Ovulate or I don't ovulate that is the question 🤷🏼‍♀️

So I've been using ovulation stick everyday sometimes twice a day and nothing ever shows up? Am I not ovulating? Do I not look into it to much? Has anyone ever got pregnant even though they show nothing. 
Additional info. I stopped having the depo October 2016. Period came back end of January. I don't have a average cycle yet. Mostly a 2week gap then I'm on.