An interesting thread; it prompted me to consult the Sacred Canons:
Can. 916 Anyone who is conscious of grave sin may not celebrate Mass or receive the Body of the Lord without previously having been to sacramental confession, unless there is a grave reason and there is no opportunity to confess; in this case the person is to remember the obligation to make an act of perfect contrition, which includes the resolve to go to confession as soon as possible.
It would appear that, in the circumstances of the original post, the answer would be “no”. There is no evidence of a “grave reason”. edward_george’s post certainly reflects faithfully the content of the Canon, but the circumstances postulated do not, on their face, fulfill the requirements it sets out. In particular, there appears to be no case that a sincere act of contrition is in any way a substitute for the need for sacramental confession, except in the grave circumstances or true impossibility of confessing.
This brings up an interesting point. It is certainly optimal to receive Holy Communion at Mass, but in the past few decades, it has become, as it were, an automatic expectation. When I made my first communion (shortly after the dinosaurs departed the earth), the Eucharistic fast was from midnight the night before, and it was absolute, except for water. If you were on medication, well, next time, maybe. But it was not a cause for tongues to wag, or for blushing, if, at communion time, someone remained in his or her seat. Speaking personally, the reception of the Body and Blood of Christ is such a serious matter that I would always tend to the side of caution. If in doubt, don’t, and do something, on a priority basis, to remove the doubt.
Blessings,
Gerry