So my period has been late by five days and I'm not really sure why. I can't be pregnant because I'm a virgin. My period was irregular when I was younger but it has been consistent for about the last year or so. Could it be because a week ago I came back from this camp that I went to where my diet basically completely changed, I went from a pretty healthy and consistent, pretty low carb diet to basically eating all carbs and a few salads (what the camp provided us)? Or maybe because a day after I came home from the camp I flew about a 14 hour flight? Or also because of the time zone change? I'm just really confused on what could cause this, does anyone know?