From a reader:
This Sunday, … at the time of the Consecration, the priest accidentally used the words of consecration for the Cup both when he was holding the Cup and when he was holding the Host. He never said "This is my Body" but said "This is my Blood" twice. Was the Consecration valid? Was the Mass? I received Communion anyway, but wasn’t sure whether or not I was receiving the Real Presence. I thought about trying to attend a later Mass to make sure that I had fulfilled my obligation, but as this was the last Mass at that parish and I was unfamiliar with other churches in the area and didn’t have internet access during my vacation, I didn’t know of any later options. If I ever encounter this in the future (I hope not), what’s the right thing to do? Should I try to attend Mass again if possible, or was this Mass valid?
The priest did not consecrate the Body of Christ. For there to be a Mass, in the strict sense, there must be the two-fold consecration of the Body and of the Blood of Christ. It is precisely in the two-fold consecration that the "separation" of Christ’s Body and Blood take place in a sacramental way so that Mass is a Sacrifice.
Also, you may have received Communion with a Host that was consecrated at another Mass.
That said, yes… you fulfilled your Sunday obligation. Whatever happened there happened through no fault of your own doing or negligence. Don’t worry about that. And don’t worry about receiving at Communion time, either. You don’t have to confess this or try to find another Mass.
These things happen from time to time. We are humans, after all, we make mistakes. Don’t fret in any way.