Period changes

I’ve only had my period for a little over a year, but every month has been VERY regular, except this month. First, it was a day late, then when it came it was super light (I normally have a fairly heavy flow). Then it went to kinda medium on my second day, and today it’s super light again? Is this caused by stress? Could it be type 2 diabetes (I’m not the most fit, and google told me that’s a possibility)? I don’t know but I’m super stressed and scared, please respond!