Can I expect problems after entering Schengen through main destination but leaving from another state?

I have been issued my first Schengen visa (7 days) so please excuse my lack of understanding. Visa label says it is valid for ESTADOS SCHENGEN.

I applied via Spain as I am to attend a conference there. I will most certainly be entering the Schengen area from Barcelona. I will also be spending three nights in the city, so thus the most amount of time during my visit to the Schengen area.

From there I am to proceed to the Netherlands in order to attend a meeting at my company's HQ. I will spend two nights there. The final night I wish to spend in Paris before exiting the Schengen area from Paris.

My concern is the following: My application for the Schengen visa does not mention onward travel to the Netherlands or France. The air ticket I had submitted when applying also had me exiting from Barcelona on the final day.

I have just booked my tickets where by I enter the Schengen area through Barcelona and exit through France on the specified days. I'm wondering if I might run into any troubles with immigration in Paris on the way out. I'm also a bit worried due to the fact that I am from a country that many would consider high-risk for not complying with visa conditions. (Pakistan).

Any help in clearing up these doubts will be much appreciated. I still have a month to go before I travel so there is ample time to clear up my itinerary should this cause any problems for me.