Does my guppy have sickness

[Guppylover999]

Hi, recently my pregnant (I think) guppy (sorry the photo is a bit blurry) is always at the bottom of the tank. Recently, I had another guppy die and it was always at the bottom. Does She have some kind of sickness?  If she does, I will need to move her To a quarantine tank.

[Guppysnail]

I’m sorry for your loss. When close to birthing pregnant guppies separate themselves and often hide usually near filters. 
Sometimes guppies have issues during birthing that cause them to perish. 
These two fish both doing similar behaviors may not have anything to do with one another. 
If you have seen no symptoms other than location it’s very hard to determine if there is a problem.