If you have a blow off tube, I would use that next time. I always start my brews with the blow off tube in a bucket of sanitizer, and when fermentation slows in a day or so, I put the airlock on. Just remember, as soon as you get that blow off tube off, clean it! Those things get nasty quick and if allowed to dry, a pain in the arse to clean. Sounds like the yeast are very happy, cheers!