Describing baby movement!

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I'm almost 15 weeks and the past few days I think I've felt the baby move. I know it isn't gas but I'm not convinced ! I'm confused because the feeling I describe does seem the same as other moms. I describe it like "a fish flopping around" in there but it also feels like a gentle pulling sensation at times. I don't feel like "fluttering" or "popping" describes what I'm feeling which seems like a common description. Maybe I'm just weird and I don't describe things the same as others or maybe that isn't the baby moving? Thoughts? Do you think im feeling movement? How would you describe your first movements??