Harddisk does not recognize its full storage.

[Urana]

Hello, my laptop is Macbook Pro, MacOS High Sierra version 10.13.6. While trying to install windows by bootcamp i deleted by mistake the windows partitions and currently harddisk size seems to be 125Gb whereas it need to show 251gb. This is my first time doing this so i might be missing sth basic. Can you please help me have the harddisk at its original size? I tried with disk utility but could not make it happen.
Thank you a lot.

 

[Lufbrarunner]

Did you use bootcamp to delete the windows partition?

 

[Urana]

I used bootcamp to install it, but i deleted it by dragging it to the trash. (I know it is a very beginner's mistake!)