Upgrading to pro from public

Hi there! I started rebuilding my lost site today with simple catch, and have put a number of hours into it yet. ;). The editing I've done was in custom Css, not the editor Css, but I am wondering if I upgrade to simple catch pro, how much content modifications I stand to lose? If it's at all helpful, the site is everywear.ca Am I also correct in my understanding that the pro is responsive, but the public is not? My page appears very different on my iPad compared with my laptop. Thank you so much in advance!