Yes, having a metallic taste with the cravings of eating something tangy could be the sign of pregnancy. It could also be because of some stomach problem too. It's my 7th week in and I'm feeling the same these days. Actually I feel very sleepy too so I thought may be because of taking all these naps mouth tastes this way! I'd suggest you take a preg test right away and go see your doctor for a blood test to rule out the other causes!
Good luck!
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