So I've been having this pinching pain on the inside lower left part of my stomach when I move certain ways and when I try to sit down. I have to hold my stomach to sit down and get up.

Has anyone had this, or know anyone who has? Should I be concerned?

When was your surgery?

If it was recent it could be internal stitches pulling a bit.

That sounds like what I had. I was always holding my stomach over that area. My surgeon told me it was from where he had to stitch muscle back together with very tight, braided stitches. He also told me that at some point when they started to dissolve, I might feel a popping sensation. I felt the pop at around 3 weeks and the pain was gone from then on.

But it never hurts to call your surgeon if you are concerned! It helps to hear it right from the source so you know whether or not it is normal/if you should be worried

Yeah I called my surgeon yesterday and that's exactly what the nurse told me. That it was the stitching on the muscle that was having to heal. I haven't felt a popping sensation as of yet though.