Period help?

Okay so I'm on Mylan birth control. It's the 84 pill pack so I only have a period once every three months. Welll this was supposed to be my first period. This entire third month I've been spotting like crazy! Awful blood clots (still old blood) and cramping everything! For three weeks straight except for maybe 3 days. Well, I was supposed to start my period Monday night but here I am on Wednesday and NOTHING. Yesterday I was at work and I had a tiny bit of brown colored discharge when I wiped, but that was it, I have had anything since. Anyone have any advice on what's going on?? Never had sex btw. I've never had this issue before so I'm slightly (not so slightly) freaking out. I have a few itty bitty cramps and some awful moodiness, but I'm fine other than that. I keep waiting to start but nothing. I'll be taking my third inactive pill tonight. I need help 😔😔