The pus was creamy like that you'd find if you popped a huge zit on your face!! Yuck. Not much of it though.

Nipple is MUCH improved today, not much pain at all. I believe it was just a nipple blister (very painful one!!)....they are so hard to find though!! I must have popped the right thing
I think maybe I did have some thrush also perhaps but I've stopped the gel as it was only aggitating the blister further.
Thanks everyone for your help.