I know this is annoying....

M.
I'm going on vacation in October, I'm supposed to get my period the week before I go (THANK YOU GOD HOLY SHIT) 
But...I'm going to start taking birth control, progesterone only. When should I start taking it to keep with my regular period so that I don't end up being late or having it come during vacay? 
The last time I took it, my period came a day later than it should have, but I started to take it about 3 days before I was supposed to start. 
I'm going to be seeing my long distance BF by the way so that's why I don't take it regularly. 

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