Birthday weekend food: will I gain weight?

So this weekend I'm celebrating my birthday. That would be 3 days in a row doing stuff I would not normally do. Eating cake, cupcakes, leftovers for dinner, eating out, not enough vegetables and fruit, eating late at night, no exercise, no cal counting, etc.

I might or might not be going over my daily burned calories, I don't know since I can't log everything. So let's pretend I'm burning 1700 cal a day and I'm eating 2000. That would be 900 extra cal for 3 days. That means I'm going to gain those extra calories (converted to pounds) right?
But what happens if I'm actually eating about 1500 of bad food. Will I still gain, remain the same or still burn 600 cal total? I'm so confused right now. I just can't accept I'm eating cupcakes and still losing weight!

I decided to do this just once not knowing the consequences but now I'm feeling kinda guilty since I just found out today I lost 11 more lbs and I don't want to regret it if I do gain that back. Am I being too paranoid, should I just relax and enjoy?

First of all, HAPPY BIRTHDAY! :-)

I think you are over-thinking things. It's pretty simple. If you eat less than you  burn, you'll lose weight. If you eat more than you burn, you'll gain weight. I know that it can be hard to think that you could eat cupcakes and junk and still lose weight, but think about it this way. If you ate 3 Milky Way bars a day (one for breakfast, one for lunch, and one for dinner) you would lose weight because that is only 690 calories. What you eat doesn't necessarily matter, just how much you eat total. Eating lots of fruits, veggies, whole grains, and lean protein help you stay full longer and since they're lower calorie than "junk food", you end up eating less without being hungry. Often when we eat junk, we don't stay full and eat more junk.

Anyway, with all that said, it's your birthday and you should enjoy yourself! Just be smart and don't go too crazy! If you get back on track after the weekend, you'll be fine and I doubt you will gain weight. It takes 3500 extra calories to gain 1 pound, so you'd have to eat almost 1200 calories over your normal limit to gain just 1 pound over the weekend.

Hope that helps!

Thank you!

I'll try to relax. Tomorrow I'm meeting my mom for lunch and I was dreading it, now I feel more relieved, thanks again!