Mild pressure or pain right side navel.

From Jun of 2018 I have noticed a mild pressure or pain to the right side of my belly button.. I have had a C-section in Mar2017 and follow up sonography due to my pressure or pain of my abdomen... Nothing came through in the sonography except the known fact of two uterine fibroids... This mild pressure or pain subsided and eventually I didn't notice it or maybe it came n went occasionally over the past Yr... At no time has this caused me to stop in my tracks or disrupted my daily chores or activities... However of late again I have noticed this mild pressure or pain right side of my belly button , if I press it it can cause a dull pain ... And usually I do not feel it once I pass a stool or wind... What can this be as doctor is unable to find anything except putting it down to constipation or gas getting trapped...is it a cause for concern...worried about things like cancer or tumors or anything fatal... Hope someone can share some light on it