Trying to make cranberry wine, using wild cranberries I picked last fall. I boiled the cranberries until they popped, let cool, added the pektin extract, waited 10 hours then added the yeast nutrition, waited 6 hours then added the rehydrated wine yeast. Covered with a cloth and waited. I noticed small amount of foam after a few hours and this has grown to thinly cover the top of the jug, but nothing else. No bubbles, no vigorous activity, nada. Am I expecting to much? I don't have the acid checker, so what is an easy way to tell oif wine is fermenting, or if it somehow became stuck?