This is a very complicated subject and requires some date math skills or a calendar or an assistant.

Most civilian calendars start the week on Sunday. God calls it the last day of the week but I call it the first day I had to start dealing with this world she made. But I digress.

The term "this Wednesday" always means the very next occurrence of the day. The term "next Wednesday" always means two Wednesdays out.

So on:

Monday the 1st "this Wednesday" means Wednesday the 3rd.
Monday the 1st "next Wednesday" means Wednesday the 10th.
Thursday day the 4th "this Wednesday" means Wednesday the 10th.
Thursday day the 4th "next Wednesday" means Wednesday the 17th.

To avoid all of this hassle I just tell people I want it now damn-it!

I was going to explain this in Yiddish but I don't know Yiddish.