Brewed a 1 gallon batch yesterday. I had a no. 6 rubber stopper in the top with a 1/2 tube for blow-off. Just checked on it and and found that the stopper was blown out of the top with a few clumps of yeast dried on the side of the bottle. Not sure when this happened. My question is, should I add more yeast since it looks like I lost some, or should I wait to see what kind activity I get over the next day or so? Hopefully I can salvage this batch. Any ideas?