Possible hernia?

8 months ago I saw my gp as I had been feeling ill and she noticed I have a swollen stomach. She had a look and said I have a hernia, and she would send for me a scan. I always thought my swollen stomach was due to the pregnancy with my son and the emergency c-section I had. Anyway, I called them up on it not long ago and was told I had missed my January scan as the letter had been sent to the wrong address and that I would be put at the back of the waiting list again (not exactly fair seeing as that's their fault and not mine). However, I'm now unsure. The doctor said the hernia was likely caused by my hard labour (they left me pushing for hours and both me and my son nearly died so we're rushed for the emergency section). That was almost 4 years ago and since then I have been pregnant theee times, miscarried every time but was scanned with the last 2 pregnancies. Wouldn't they have noticed a hernia then and said something? Scans were both external and internal. Thanks in advance :)