I have been ttc for a month now and I had a cat scan on sunday where I was tested for pregnancy. It was negative however I still have no period and i'm feeling quite ill. My breasts are still sore and I also have odd metallic tastes in my mouth (and I haven't been licking any metal) is it possible that I may have conceived only days prior to the test which is why is showed up negative and that I could in fact still be pregnant? Or am I crazy?