What is your age?
is the pain in the left side of the abdomen all the time - or mid cycle?.
in my late 30s - at times I could tell by the pain when the egg was dropping out of the ovary
It would hurt like crazy for 30 minutes or so.
Have you ever laid flat and palpated your abdomen?
To see if you felt anything or any specific sore spots?
I would do that and if you feel any unusual lumps or super tender places - then I suggest a dr visit to check it out.
You might even find videos online showing how to palpate and what to check for.