Eating habits? Please read..

Anyone know about eating habits and it changing your period cycle or ovulation? Typically, I eat pretty healthy but have been away on vacation and have been eating all sorts of shit. My period is late as of tomorrow. I have no symptoms of pregnancy and don't believe I could be because I have taken tests but they are negative. I am trying, but I believe with my eating habits it's changed everything and that's the reason for negative tests.