I found the same thing when I went to check on my Creme Ale this morning (day 3 also)...it was awesome that I caught it before it blew off....same thing happened a few weeks ago, but I had to find the airlock because it did blow. I think it is pretty common, that is why many use blow off tubes. I changed mine over to a blow off tube and it continued bubbling away. I just took my siphon hose and stuck it into the airlock tube (all sanitized, of course), then put it into a jar of sanitizer. You'll be amazed how much C02 blows through there is you have an active germentation.