Is this gallstone?

I just did my first flush yesterday. This morning I went to bathroom and expelled many grains. Most of them are very tiny, the biggest is just quoater-pea size and in green. I found they are very very soft and easy to crush--no hard core inside.
I wonder is this so-called gallstone?
PS: my first flush was very smooth. I didn't feel any pain during this procedure. Just cannot sleep during the night.
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