Water Weight or Actual Weight?

So recently I lost some weight which I am very happy about! With that excitement came some lenience over my once-strict regime. I lost about 8 pounds in three weeks and then gained back 4 pounds over the course of 2-3 weeks. That means I consumed 14,000 calories on top of my normal caloric intake???... I thought it was water weight until the number on the scale was constant over a number of days. (Also, ladies: I'm 11 days "late" on my period if you want to factor that in...)