There are a few possibilities regarding what may be going on. While it is unlikely after 14 years, there is a small possibility that you have developed a hernia through your incision site.
The location of the pain may also be indicative of a bladder infection. These can be present without fever, although they generally give some other symptoms like pain with urination, increased urination and increased urgency with urination. (These symptoms are not 100% though.)
With the lifting it is very possible that you have pulled a muscle.
If these pains continue I would recommend you see your doctor for an evaluation.