i never ferment in the bucket with the spigot. i own one bucket with a spigot (bottling bucket) and 8 buckets without spigots for primaries. its ok to break the seal, just dont spit or sneeze in it. try and keep dust out of it when you pull off the lid. i always let them sit for 2 weeks before i even check gravity. it doesnt hurt it at all to let it sit a while longer. if you are really anxious, sanitize a plastic cup or a glass beer mug with a handle on it and dip it in there and use the hydrometer to see where you are at. if you can stand it, leave it sealed for at least 2 weeks. the longer the beer sits on the yeast (up to about 4 weeks), the more clear the beer will become... dont judge the progress of fermentation by the bubbles in the airlock. it can keep fermenting long after the bubbles in the airlock are gone..
Fermenting: 12g Elevated Line California Lager
Kegged: Elevated Line Toast IPA, Founder's Breakfast Stout Clone, Elevated Line Blonde, Elevated Line Christmas Molasses Porter
On Deck: Death by Dunkel, Mango Lambic?, Barleywine, Wheat, Cali Lager, Pilsner, Honey Porter, etc., etc...