Belly piercing problem? Help? Advice?

Okay. Today I've had my belly piercied for 4 weeks already. During the 3rd week I started noticing that I had a white/light green mucus discharge coming out. I haven't changed it, and I clean it 2x a day. I'm still wearing the original barbell that I got when it was pierced. Oh, and is it normal that the piercing is purple/darker around both parts of the piercing? And p.s. it gets stuck at the bottom because of the white discharge and last night when I cleaned it, a little blood came out.