Odd feeling pregnant? But..

Debbie
So I'm roughly 9 days after ovulation. Nausea, vomiting, metallic taste in my mouth. Everything smells and tastes bad. A negative serum (blood) hcg. But I feel like absolute dirt. A had a random spotting a few days ago. I think I should wait out my period but it isn't due till 11/18. I roughly ovulated on Halloween.. Any ideas??