Kinda freaking out...

So my period was late this month. I use to start my period right on the 28th day. I was never late. Last month I was late by a few days. This month I was late by a whole week. May not seem like a big deal but I know my period. Saying that I know that my blood isn't usually brown at the beginning. I have no idea why it is now but its kinda freaking me out. My period has never been this late or this color.