What is YOUR definition of "signs of fermenting" that you are referring to? Are you saying the AIRLOCK was bubbling? That is really not an accurate "sign" the airlock is not a fermentation gauge, it is a valve to release excess co2 (and even02 as it is initially being purged by the co2 building up initially after the yeast starts working.) But many beers brew without a blip in the airlocks, others ferment strongly and bubble for a couple of days, but as the excess co2 production winds down there may not be a need for it to blip, yet there is still plenty of fermenting it still needs to do.
That's why you need to take a gravity reading, NOT go by airlocks. The most important tool you can use is a hydrometer. It;'s the only way you will truly know when your beer is ready...airlock bubbles and other things are faulty. So is looking at the amount of kra usen you have or whether it is still there or not . It could have been a very fast and clean ferment and the krausen could have formed and fallen quicky, or it still hasn't formed yet, since sometimes there's a 72 hour lag time before it even begins to form.
The only way to truly know what is going on in your fermenter is with your hydrometer.
Like I said here in my blog, which I encourage you to read, Think evaluation before action
you sure as HELL wouldn't want a doctor to start cutting on you unless he used the proper diagnostic instuments like x-rays first, right? You wouldn't want him to just take a look in your eyes briefly and say "I'm cutting into your chest first thing in the morning." You would want them to use the right diagnostic tools
before the slice and dice, right? You'd cry malpractice, I would hope, if they didn't say they were sending you for an MRI and other things before going in....
Thinking about "doing anything" without taking a hydrometer reading is tantamount to the doctor deciding to cut you open without running any diagnostic tests....Taking one look at you and saying, "Yeah I'm going in." You would really want the doctor to use all means to properly diagnose what's going on?
So if you are in doubt, take a reading and it will tell you and us what is happening.