Confused

So I'm very confused.

I was supposed to ovulate September 8th

I end up have a weird period from 10th to 13th. It was 2 days on and off from light red to brown then stayed brown on and off for 2 more days. I had some cramping never had that before. I get very nauseous around smoke and when I get in the car. Its all knew to me.. What's going on with me