delaying period?

Br
So I have pcos and very irregular periods. Now that I am on metformin and some type of ovulation medication I have been pretty regular. Would it be wrong of me to hold off on the ovulation medication (usually makes my cycles 24-30 days) and just take the metformin (about 38-40 day cycles) so that I can go away in July on vacation without my period? 

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