Normal or not normal??

So I am 6 months pp. I exclusively pump. Tonight after a 20 min pump session I looked down and noticed pink breast milk on the left side. I always use nipple cream to avoid cracking/bleeding. This has NEVER happened before. Has this happened to anyone? From what I read online it could be a busted blood vessel, or cracked nipple. So scary! Regardless I plan to tell my doctor what's going on.