Combined pill help?

[confused123456]

I've been on the pill for years, but I'm now thinking I may have been taking it slightly wrong.
I'll base it on my last cycle/ my last month of pills.
I'm on a 21 day pill. I finished the last pill in the pack on Monday 21st August, so I am currently on my 7 day break. People say you should always start the new pack on the same day. (I obviously started the pack on Monday 31st July), so does that mean I should start taking the next pack on Monday 28th August, or Tuesday 29th (I've been counting 7 days from the day AFTER I take my last pill, so Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday, Monday. Then start the new pack on Tuesday (it's always a day later in the week every month).
Do you include the day of your last pill as a day? Otherwise how do people always start a new pack on the same day?

If I took the last pill on a Monday I would take the next pill, after a weeks break, on the Tuesday. So I would start every pack on a Tuesday and finish every pack on the Monday. If I was taking 2 packs back to back I would finish one pack on the Monday and start the next one the next day - the Tuesday. So that's what I'd do with a weeks break.