Thank you all again, I've graduated on saturday, but after I had to re-do that xc flight, the school did pay for it though and also they gave me a non-profit rate for the rental of the aircraft for the check ride.
So in the end, looks like the FAA considers the "original point of departure" to be the first airport you take-off from and not just the airport the leg starts at.
So all commercial-to-be pilots out-there be careful to have at least 100nm on the first leg of that cross country.