Belly button leaking after open umbilical hernia repair (Photo)

I had major open surgery to repair my umbilical hernia my cut seems to be healing fine swelling has gone down as it's now 16 days the last few days started leaking from my naval first was bleeding slightly now it'sfluid it doesnt smell but seems to be more than it was days ago iv seen a nurse and she has packed it and I'm to go back tomorrow I went yesterday I can see the packing is covered I am worried has iv never had surgery before so don't know if this is normal or something to worry about