I blew it!

Easy on-- easy off! Have a great week!

Some of that is probably water weight and some is probably just from the increase of food in your stomach. How long it will take to come off is hard to say. I held on to 2 lbs of water/food weight after easter for 6 days. Then it just dropped off all at once.

For it to be 3 lbs of fat you would have had to surpass your maintenance by 10,500 calories. That's a lot. Example:

Say you maintain at 1800 calories. That means in those 3 days you can eat 5,400 calories before you would gain fat. Doesn't matter how those calories are distributed. As long as they don't surpass that amount, any gain is from increased food in your stomach and water weight. To have gained 3 lbs of fat, you would have had to eat 15,900 calories over the weekend (if your maintenance is 1800...if it's higher than you would have to eat even more).

Another way to look at it:
You would have needed to be over maintenance by 3500 every day.
If you have say a goal of 1300 calories for 1 lb per week loss that would mean you would need to eat 1300 + 500 (deficit) + 3500 = 5,300 on all 3 days.
If you have say a goal of 1300 calories for 2 lb per week loss that would mean you would need to eat 1300 + 1000 (deficit) + 3500 = 5,800 on all 3 days.

Drink some extra water this week and you'll be fine. You didn't blow it, you enjoyed your birthday. That's what happens in life, we have events where we indulge a bit and as long as you get back on track before going too far off the rails that's not blowing it. That's living real life. Happy birthday - now go drink some water!