pregnancy symptom?? 🤔

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Let me start off by saying that I don't think I am pregnant. My husband and I are not trying for a baby however we do only use the pull out method, which I know is not the best form of birth control, but that's besides the point. For the past 3 days I have had this metallic taste in my mouth that I cannot get rid of no matter what I do. It tastes so bad that it has even started to make me nauseas. I asked my mom about it and she said that it might be a pregnancy symptom.. I had never heard of such a thing but then I googled it and i found that in fact it could be a pregnancy symptom. Has anyone felt this and then found out they were pregnant? Is this common? Or better yet, does anyone know how to get rid of it?? Help😩