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is it possible to know if field is filled or not? How do I do this verification?

Just use getValue? Or am I missing something?

I need to check a record, and know if it's filled, I have to do something

I really dont get the question, whats the purpose, whats the context

If you want to check the value of a body field, search.lookupFields is the preferred slimmer version.  It doesn't tell you anything about it being "filled", just because a field is not empty does not mean its not filled out, it could be intentionally empty.

I don't know if that will be clear, when a record is filled, it will also fill in a duplicate of an invoice, based on payment terms. He understands? I was asked to do this, so I'm looking for some way to accomplish this task. He understands?

Aa <@U7XBU8Y3B> suggested, you will have to check for a field in the record to validate your condition. For any case/condition,  it would be enough to check a field or few fields. Try and find the field on the record that does the job for you.