useEffect returning different values in React

I have an API asking for a query in PostgreSQL, so I have this:

const getPresupuestos = () => {
    return new Promise(function(resolve, reject) {
      pool.query('SELECT * FROM presupuestos ORDER BY id ASC;', (error, results) => {
        if (error) {
          reject(error)
        }
        resolve(results.rows);
      })
    }) 
}

And then in the index have this:

app.get('/', (req, res) => {
  bd.getPresupuestos()
  .then(response => {
    res.status(200).send(response);
  })
  .catch(error => {
    res.status(500).send(error);
  })
})

The problem is that I have a react app from where I'm trying to get the value of the query as a string with this code:

    const [presupuestos, setPresupuestos] = useState(false);
    useEffect(() => {
      getPresupuestos();
      console.log(presupuestos) //return in console
    }, []);
    function getPresupuestos() {
      fetch('http://localhost:3001')
        .then(response => {
          return response.text();
        })
        .then(data => {
          setPresupuestos(data); //value wanted
        });
    }

And the first time I execute this, the console.log returns the query I want, but if I refresh the page I get a false from the same console.log.

I'm quite new to React, so I would be grateful if someone could tell me why is this happening and how to get the value that I need.

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