Many of us experience what you are going through. It could be your body is putting on muscle, retaining water from too much sodium, PMS....It is normal to fluctuate a bit.

I looked at your fitday and just a couple of things you might want to consider. You are using milk in your coffee. Milk has sugar in it-why don't you try using real cream or at least half and half? Also, your protein looks kind of high in relation to your fat. You might want to check your ratios. Most people here report that they do best with at least 65% fat and 25% protein. I personally like to keep my fat at 70% of my calories.