Question about ovulation tests

So i have always had very irregular periods. According to this app I'm on my fertile week so for the heck of it I have been taking ovulation tests. Well they've been the closest to a positive than they've been in a while. I took one yesterday and now there's no line what so ever. I took a few more and still not even the faintest line. Would that mean I missed my actual positive ovulation test? The others were so close but not actual and now there's nothing. Just a tad bit confused.