I'm on day 3 too. Feeling good.
10 days is the recommended minimum to get some deep cleansing action going on. If you really feel that you can't make it that far, do what others have done and do a shorter fast at first - it will help you build up to the full ten days. But you do have some Day Three buddies to help you and support you in case you want to go all the way!
Occasionally someone throws up some swf, it's usually because of the temp of it - did you drink it cold? Might want to try changing the temp to warmer, and maybe not chugging it down - sipping might be better for you. I'm glad to hear that you're feeling fine otherwise! Keep posting your progress - I find it very encouraging myself to hear how others are doing!