No period, but infection

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My husband and I have been trying to conceive for the past 6 months, and thus far no luck. I am almost two weeks late but the past 5 days I have had a yeast infection. Has anyone ever had that happene where it makes your cycle screwed up? 
(The infection has been gone for rocky 3 days and no Perido yet) I've taken two tests and they have come up neg. 
thanks :)