Hi, I Had A Root Canal And A Crown 5

Hi, I had a root canal and a crown 5 weeks ago. I was told the crown would be all porcelain...no metal. It’s an upper molar. I have just noticed that there is a black line along the new crown on the inside of my mouth. Can this be as I have a no metal crown? There is also strangely enough a grey/ black mark at the base of the next tooth...my eye tooth. I have no cavities or other issues with my mouth... thank you Carol