VEGANS/VEGETARIANS HELP

So I’ve been vegetarian for about a month now and it’s right around the time my period should start. I’ve had cramping and usual symptoms. But I am not sure if I started or not. There’s time through out the week where I’ve bleed very lightly and it stops. So I’ve either started or I am a week late. I am NOT PREGNANT for sure 100%. I just want to know if this is normal or if something similar has happened to anyone else? (Anything helps)