i think my platty is ill but no signs

[ginty]

i have two plattys and 6 guppies. i have a new 110l tank that i will be putting them in. i added 3 new guppies two weeks ago. for the past 3 days my female platty sits on the gravel for most of the day. ive done a water check, and my water is fine. nitrate may be a little high. at 30. so i did a water 50% water change.
i cant see any marks or spots on my platty so im not sure whats wrong. she comes up for food and has an occasional swim, then goes to the gravel again. :/
could it be because i have 6 guppies and only 2 platties? is she depressed? i used to have 4 plattys but lost 2 over 2months ago

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[anibis]

Does she look preggo? She may be ready to pop.

 

[ginty]

Does she look preggo? She may be ready to pop.

she doesnt seem to have a big belly.
what are other signs of pregnancy other than a big belly?

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