Is this normal? 😫

I have pcos so my cycles are usually really long, like 45 days long. I have never had any spotting in between. I am now on CD 19. Well 4 days ago on CD 16 i started spotting and it looks either really dark brown/black or like the picture i have below. I thought that it could be ovulation spotting but I track my BBT and I clearly have not ovulated. What could be the cause of this? Do I need to make a doctors appointment?