Spitting stitch or infection? (Photo)

I had a breast uplift 9/5/17 so nearly 3 weeks post op. I noticed when I had my bandages removed 23/5/17 that a I was leaking clear/yellow substance. It's not leaking out but just shows dry on steri strip and bra when taken off. I have also noticed a little pocket at the end of my incision not too sure whether the pocket&drainage is infection or spit stitches. The area isn't red nor have I got a temperature. And also black bits around the nipple, dry blood or infection