Metallic tastes and SO

I know that a metallic taste in your mouth can be a sign of pregnancy, but I'm not the one who has it... My fiancé does. I'm two and a half weeks late for my period, but all tests have been negative. I have a few symptoms like sore boobs and sensitive nipples, a little nausea that comes and goes, easily tired, pressure in my lower abdomen and off and on cramping. I'm making a dr appointment to get a blood test done, but I was just wondering if anyone's SO has had this instead of them??