A few things could be happening. Your doctor should know that ovulation tests can tell when you have a surge in the hormone associated with the release of an egg, but they don't actually tell you whether you are ovulating. Your body may prepare for it, but that doesn't mean it happens... or at least not every cycle.
This can sometimes also be an issue with irregular cycles. Odds are that you are not ovulating every cycle.
How long have you been using the ovulation tests? If it is not too personal, you don't have to answer if you don't want to... are you by chance a bit overweight? Have any concerns with facial hair, stray hairs on your chin for example? Any skin problems, such as spots? Have you had any ovarian cysts?
Certainly try the pregnancy test in a week and see if it is due to being pregnant. If it is negative, you could ask your doctor about having a blood test done.
Again, since you have a history of irregular cycles, it may just be a continuation of that.
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