>Putting the same amount in every week or month is DCA.

Check out the wiki on investing:

https://www.reddit.com/r/personalfinance/wiki/investing/

Dollar cost averaging is when you have a sum of money that you want to invest and, rather than investing it all at once, you spread it out over time. If you are investing as you earn, it's not technically DCA. And as the wiki says, it's generally better to just invest the lump sum at once. But by the same logic, it's better to invest as you earn rather than saving it up to invest later (which I need to be more disciplined about tbh)