Originally Posted by k-trips
Still does interest me as to why some people can't get a ferment to start for several days and my one started in 20 odd minutes.. Have I done something incorrectly?
Short answer, no.
Long answer, we would have to know your recipe to know more and even still, no.
Since you are using an S type (2 chamber) airlock then your bubbles might have a little more force to them because of the narrow passage way. If you were using a 3 piece it may not appear as vigorous because it is easier for the gas to escape.
I want to mention it is recommended to use something that will stay sterile in your airlock (star san mix or vodka are common). The reason being if you have "suck back" which it sounds like you may have caused while pressing on the fermenter. DON'T WORRY, during the vigorous stage of fermentation is the most difficult time for your beer to become infected.
If it has started to ferment I would not try to draw a sample to take a Hydro. If you brewed an extract kit you should already know the expected OG and that should be good enough.
There are so many variables to fermentation and it is the goal of the brewer to minimize those variables. Yeast health, yeast count, pitching temp, fermenting temp, fermentables, un-fermentables, etc etc... This is why some brews will take longer than others to get going. This is your first brew and I'm certain you will at some point have a slow starting batch, unless you start using a good starter everytime which usually decreases lag time the most.