If you seriously suspect it, get it seen to asap. If your doctors can't fit you in soon then you may even have to suffer they joys of a&e on new years eve. It can turn from you feeling like it's a heavy cold to near unconsciousness within hours.
You probably don't have it, but better to be told that than have left it. Lots of colds and coughs going around right now too, reason am up at this time myself too. Colder and damp but still hitting around 10c in Manchester, ideal for bugs, as is the fact that and washing hand covering mouths seems to be a lost artform to many.
Our daughter came down with pneumonia at the age of two. Despite two trips to the doctors the week before it wasn't picked up until we rolled into a&e and we nearly lost her, after her temperature rose suddenly to around 104 iirc, after a week of cold like symptoms. She only turned it around once the antibiotics were given, by which time she'd not eaten for almost three days. Apparently once you've had it once you're more susceptible to it too. Second scariest moment of my life, so if you suspect it then get a professional to check.