steroids have lots of side effects, however since you are only taking it for six days, it is doubtful that most of them will happen to you. If you get any, it will probably be night sweats, or nausea, or being extra hungry. Moon face can happen, but it usually happens with larger doses. Most of us were on very high doses, like i was on 60mg for months. in that long of a time you will get most side effects.
You will also probably either get some extra energy, or be extra tired.