it shouldn't i am on that too. i have to take it for five days every 45 days to get my period or i don't get it at all...or i get it and it doesn't stop...lol
i did this same thing a few months ago...it didn't screw up my next cycle at all...because it is usually such a small dose like 5 or 10 mg..if it does anything it will probably be minor and possibly unoticed...
i would also like to know if by taking progesterone suppliments for one day because i thought i was preg will that screw up my next cycle?