Is this a normal Platy?

[hadezown]

This isnt a picture of my white platy but its similar to it (i dont have a decent camera). The redish line above its stomach and the redish spot on the bottom left of its stomach there, is that normal? My platy has red marks exactly like the one here, is that ammonia or nitrate poisoning or does it mean she's healthy?
thanks

 

[green_fox]

the red line above the organs is the spine

 

[hadezown]

When i first bought my platy the spine wasnt red, sorry forgot to mention that. When i first bought the platy it was almost all white then it has gotten redder the past month