Black wisdom tooth

I recently scheduled my wisdom teeth surgery for the beginning of January. When I went in for my consult a month or two back he said everything looked great and that I could wait up to 6 months before getting them removed. Last night I saw that one of my grown in wisdom teeth is a dark brown/ black color. Should I go in sooner for my removal? Is this something I should be concerned about? It’s not bothering me at all And I try to brush and floss twice a day. I’m just not sure why it’s that color