Is vegan diet affecting my menstrual cycle?

I've only started doing a vegan diet about a month ago, and before that I was eating meat, drinking milk, eating eggs, so I just quit animal products altogether. I've been vigilant about supplementing myself with nutrients, so I don't think that's the problem. I have been eating more tofu/soy than my body's been used to--- maybe 3-4 servings a week. Other than my diet, I think I've been pretty much the same and have not been under stress. So, my period came in 4 days late this time, when I'm usually regular. Was this a result of the change in my diet? Can anyone share with me instances wherein this has also happened with them? Will it go back to normal?Is vegan diet affecting my menstrual cycle?
You're probably not eating enough protein, and this change has effected your entire body. It may or may not go back to normal, and if you don't eat enough protein every day, you could develop other problems.

Take your body weight x .5 = grams of protein needed per DAY. (Divide it by 3 and that's the grams you need for each meal, 3 meals a day)Is vegan diet affecting my menstrual cycle?
It's important to know how old you are.Peri menopause can start as young as 40 years of age.If that is the case,you may be starting.One of the symptoms is a screwed up period.I've been through it all.You may e-mail me if you have questions.Also,any extreme changes reguarding your body can affect your cycles.You can also see your obgyn.Is vegan diet affecting my menstrual cycle?
Fat can also affect your cycle... not enough can completely stop it altogether. So maybe that could be it?