Missing Photos in Google Photos app after deleting photos in my phone

[AC Question]

This is what happened.
I have downloaded Google Photos app.
I then synched all my photos (2000+ of them) and checked Google photos and saw all my photos there from 2007 until today. All my photos were there.
I then selected and deleted all the photos from my phone.
When I quickly went back to the app, I realized 80 % of my photos in the app are gone.
All of this has happened within 5-10 minutes.

Anything I did wrong, or anything I can do to recover all my photos.
I used some 3rd party apps such as "Photo Recovery" but still missing most of my pics including some from my wedding etc....

 

[ToolWiz Privacy]

Maybe you deleted your photos before they are completely synched. Do you have dropbox or google drive on your phone? Try if you can find your photos back from clouds.