What is a Copyright?
A copyright is the ownership of your work...aka your artwork, designs, photos, website, book, music, video, or source code.
If you own your copyright, then you are the only one who can use your work. That means you can stop copycats from stealing it. But, if you don't own your copyright, there's not much you can do to stop copycats from taking your work + claiming it as their own.
So you need to copyright your work asap.