I am a new comer to beer brewing.  I started my 4th batch this week (a kit, Brewers Best English Pale Ale) and after 4 days I have not seen any bubbles in the airlock.  I am using a plastic bucket to ferment and have taken the lid off twice to try to reseal it.  There is a foamy mixture on top of the brew which makes it look like it is fermenting.  I have used this equipment for all my previous batches (3) and it worked before.  If there is a leak in the fermenter, will the brew still ferment properly?  Is there any way to check the brew to see if it fermented?

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