I've Been Having An Odd Taste In My Mouth That

I've been having an odd taste in my mouth that is not caused by food. It is metallic and tart. Could this be a cancer indicator? I have not changed medications. I had a bad read on a mammogram on Fri. As well as a very suspicious ultra sound. Both breasts were indicated. I am awaiting to have a biopsy scheduled and this is hard to wait over the weekend. My sister died of breast cancer when she was 39. My other died of colon cancer at 52. I am 59. YYYY@YYYY (UPPER CASE LETTER "D")

Thank you, Lisa