Heaven's request is that we go to confession on the first Saturday of the month. If there is a good reason why this is not possible, it can be anticipated but, on the first Saturday, you must be in a state of grace at the time of Communion. The confession must be made with the will of making reparation (or amends) for the offences that were committed against the Immaculate Heart of the Blessed Virgin.
Message from Jesus to Lucia, Pontevedra,
February 15, 1926:
“My Jesus! Many souls find it difficult to confess on Saturday. Will thou allow a confession within eight days to be valid?”
“Yes. It can even be made later on, provided that the souls are in the state of grace when they receive Me on the First Saturday and that they had the intention of making reparation to the Immaculate Heart of Mary.”