@Mollyjai88
If you've already tried searching your computer [Click the Start button and in the search box, type Sims 4 and follow the path it gives you] and checking that the game files weren't saved to some where else on your hard drive, external drive or OneDrive, you might try contacting a local computer repair shop to see how much they'd charge to possibly recover the Sims 4 files.
Something that maybe worth trying is to launch the game, create a new Sim and save the game. Go back to the Main Menu and press the Load Game button. Select a saved game. Mouse over or hover over the tiny folder under the game saves information. Like shown in the photo in the post linked below:
Sims 4 - Lost all Saved Game Data - https://answers.ea.com/t5/Technical-Issues-PC/Moved-Sims-4-folder-to-desktop-and-have-now-lost-all-game-data/m-p/7321604#M131867
This will hopefully give you an idea of where the game is saving your saved games.