as part of your preparation for entering into the full communion with the Catholic Church you will be prepared for and celebrate the sacrament of penance and reconciliaion for the first time, before you are received. Usually a penance service of some kind and an opportunity for all to confess at a time set aside for your class will be offered. You do not have to wait for that date, however, if you feel ready to confess sooner. Simply go to the priest and explain that you are a Christian preparing for reception and now are ready to make a general confession of all grave sins of your past life. He will guide you. You probably have been given a book of some kind already that contains the form for confession, and a suggestion for examination of conscience, if not, ask your catechist for this.
What happens if someone dies while still in RCIA, but before reception? the unbaptized candidate (catechumen) is considered to already have expressed desire for baptism when they celebrate the rite of acceptance, or indicate their readiness to proceed to baptism, so would be entitled to a Christian burial and presumed to have been given the grace, by virtue of their desire for baptism, to acknowledge and choose God at the moment of death. The Christian candidate is of course already baptized and has sanctifying grace and as with anyone who has not the opportunity to seek out the sacraments before death, may express his sincere contrition for any sins, and is presumed to feel such contrition by virtue of expressing his desire to enter the Church.
We trust in the mercy of God, it doesn’t get any better than that, this is Divine Mercy, not human mercy or judgement we are talking about.
Welcome Home! the wait is part of the journey, expectant mothers know exactly what you feel in wishing the day would come, but they know the waiting is a necessary period of growth, just as your waiting is part of your growing in faith.