Not necessarily. Massage (especially regular massage) gives your immune system a boost and also flushes toxins out of your body making it a great way to help you get over a cold faster. You should be aware; however, that by doing this it may enhance your symptoms as it speeds up the natural progression of the cold. If you think you may or may not be coming down with a cold, you may wake up the next morning to find that you do in fact have a full-blown cold.
This is very normal and you will most likely find that with proper hydration and rest in addition to the massage your cold will go away much more quickly than usual. There are plenty of tissues lying around for runny noses and I can be sure not to keep you faced down too long if you are having trouble breathing. That being said, if you ever feel too sick to leave the house, or your instincts tell you that you need to just sleep then by all means you should cancel your appointment.