Why am I bleeding?

So I missed a pill and took 2 the next day, like you’re told to. And this happens every so often and nothing weird happens. But my period isn’t until next Tuesday, and I spotted yesterday some brown and today I’m spotting more some red. Like blood red. Do I have a cut maybe in me? Or am I spotting from the missed pill? I normally don’t spot red at all just brown. Lmk thanks!