Congrats! Just want you to know Swarthmore doesn’t presently have grade deflation. Median GPAs are actually some of the highest in the country. The work is hard, yes, but the professors don’t arbitrarily limit the amount of excellence they can recognize. The first semester is P/F to help you get adjusted to the rigor. Don’t worry about it! Look forward to the great things awaiting you in the coming years 
Source here: http://www.gradeinflation.com/Swarthmore.html ; you can compare against other schools at the bottom of this: http://www.gradeinflation.com/