Kind of scared

I have a couple days now before I start my placebo week, and what I thought was spotting a few days ago was my period coming early! I don’t know what would manipulate this, but I have a thought. I usually eat pretty healthy, but the last few weeks I’ve been pretty much pigging out. Can change of diet affect your period? And if I end my period before I’m in placebo am I even safe ? Since I basically won’t be taking any real hormones for a week. Help I tried to call my gyno but they can’t get back to me til later