Did your doctor prescribe you the right antibiotics? I am glad that the stitches are put. The yellow pus denotes that the wound may be secondarily infected. It is better to get the pus cultured again to look for the infecting organisms and get the right antibiotic prescribed.
Please get it examined by your doctor again. For pain, you may take Tablet. Tylenol
after food for a day or two.
Get well soon.