If you went to Confession and admitted all the mortal/venial sins you’ve commited and at that time you were unaware of any, and were still unaware throughout Mass with the homily, etc. and suddenly just as you were walking up the aisle to recieve Communion, you remembered a mortal sin you totally forgot to confess, even though you were really unaware of it even when you were confessing it to the priest! And heck, you’re walking up to recieve Communion and there are people walking up behind you, what the heck do you do? Do you think, “oops” and turn around or what? Or would you just not recieve it and since you’re already up there, just get a blessing?