7mo PP - lots of discharge??

What is this??

I'm 7 months PP, and I nurse. I've had one period since giving birth and it was about 1.5 months ago. Before I had that first period AND now again, I am having TONS of clear, odorless discharge. To the point where I have to use a pad and when I wipe it's like several wipes of clumps of it. Wth is this? I've never experienced anything like this before pregnancy. Is this just how it will be from now on pre-menstrually?

There are no associated symptoms except pre-menstrual cramps which are normal for me. I have a history of endometriosis which I had surgery on two years ago.

Thoughts?