Yah, I had leaky "stuff" on the gauze too.. My doctors office called me every day for 3 weeks to check on me.
When I still had the drain I asked them, and they said "if it isnt green like puss, and it doesnt smell yuk, youre fine."
You just have an open wound, so keep it covered and change the dressing every day. Make sure its clean, and have clean hands when touching. If your allowed to shower (I was, and was told to just let it hang when showering.) my surgeon even told me dont worry if soapy wanter gets in the wound! hahah
word to the wise... its going to feel odd when he removes it. deep breath as he pulls it out.