Period 2 days after ovulation

Nikki
I had what I think was a period just two days after I ovulated (using ovulation test) and it lasted 5 days. My periods usually last a lot longer (around 12 days). I have felt nauseous, sore throat, fatigue and a large canker sore. I even threw up one day. I tested on 9 dpo and 13 dpo, both bfn. I am now 16 dpo and just feel different. Anyone experience something like this?