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If you took 3 test and they were all positive then there is a pretty good chance you are pregnant. The tests just don't go positive because your periods are irregular. Best thing to do is make an appointment with your doctor and get a blood test done as soon as you can. That way you can know for sure so you can start on your vitamins and get off any bad habits (if you have any) instead of waiting around for your period to show up. Best of luck to you.
Yep, 3 positives I would say you are pregnant, regardless of your irregular cycles!