Potty Training Weekend

When I potty trained Jed I found this "Potty Training in Three Days" method online and it worked like a charm. He was fully trained by 20 months. Now Cruz is 21 months and has shown signs of readiness for sometime now. I finally had three consecutive days with nothing planned so that's what we did this weekend. The first day was hardest, as usual, second day just a few accidents, and today the third day we haven't had any accidents. This is bittersweet. Soon I will have TWO boys in chonies. What is happening?!