Tmi blood from nipple

So I got home from work and took mybra off and felt something running down my boob...

I'm a FTM 21 weeks.. I know that the first milk is producing but WHY IS THERE BLOOD..?

Im confused and worried now.. it keeps dribbling out with little drips of blood 😥

I've got my next appointment for this Thursday and will definitely make sure to mention it !