Yes, I have it too. Its like a metallic taste, even till my 2nd trimester now, only its milder. Should be the hormones changes that causes this. You can try taking sour stuff like orange juice, tom yum (provided your tummy can take it), I like beef noodle with lots of limes squeezed in, it'll help break through that taste and cleaning your tongue when you brush your teeth too. Both works for me.