Confused! Positive & negative today. Please help.

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I have been testing this cycle since my period ended to see if I am ovulating since I just found out I have cysts on my ovaries.

All tests have been negative until today (day 16 of 32). I took the clear blue digital advance test this morning and got a blinking smiley, but I just took a cheap stick test right now (4:00pm) and it was negative.

Thoughts??