Weird taste of residues in my mouth

I’m already at my third trimester and I have this weird taste of residue in my mouth throughout my whole pregnancy. I asked my preggy friends and non of them have it. Is that what they refer as metallic taste? I enjoy eating still and always tend to eat more to just get rid of the taste in my mouth but it lasts 24 hours everyday. Any mummies feel the same way and does it go off after giving birth??? It’s so ew!