Which Wednesday is it? The Wednesday from this week, or the one before?
This phraseology is inherently ambiguous in English and we might be better served by using a different style:
The day before yesterday: "Two days ago"
The day before that: "Three days ago"
...etc. By the time you'd get to "Seven days ago", it would say, "Last Week". IIRC this is how macOS handles it and it's clearer than "Last <day>" which is ambiguous regarding whether that day is from the current week or the one before it.