Ladies I need help

Sydney

So I am on birth control and this has never happened before while I was on it or even when I wasn’t on it. My periods are pretty consistent and regular and I’m not supposed to get one for 5 more days. A few days ago I had what looked like brown discharge and there was even more the next day so I assumed it was a little spotting. Yesterday there was a lot more so I assumed I started my period and put in a regular tampon and it was abt half full when I took it out after 8 hrs. Then today I have not even a panty liner full of it. Is this spotting or something else?