This sounds exactly like what I had, on my left side. It was like an egg, it would disappear and reappear at random times. It would also disappear when I lay down.
Turns out it was a hernia. Though I have 3 babies, he said mine was not caused by that, of course mine was the less common kind *insert eye roll*. I had a day surgery last Fall, where they went and repaired it.
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