Could I be pregnant? - metallic taste, spotting, but negative test?

I am on the pill but missed one my first week of this pack. The last week and a half I have had several pregnancy symptoms--nausea, metallic taste in my mouth, certain food aversions/cravings, increased hunger and fatigue. Yesterday I had very, VERY light brown spotting. I am supposed to get my period this Saturday but took an early pregnancy test this morning. It was negative but that just doesn't feel right. Is there a chance I could be pregnant regardless of the negative result?