2lbs overnight?!

Don't be discouraged! I'm pretty sure that has nothing to do with you increasing your calories a bit. Sometimes our bodies just hang onto a little water or something. I'm certaint that if you keep doing what you've been doing, including drinking plenty of water, you'll be back down in a day or two.

If you ate more than usual yesterday, even if you were under your goal, you will have more food in your system than usual. If that food included more sodium or carbs than usual, then you will be retaining more water than usual. Food and water both have weight. You haven't put on 2 lbs of fat overnight.

It's fine to weigh every day if you like doing that, but you have to learn pretty quickly not to freak out every time that number goes up. I weigh every day and it goes up probably 3 days a week on average. It doesn't matter though, because the overall trend is still going down.

If you ate more than usual yesterday, even if you were under your goal, you will have more food in your system than usual. If that food included more sodium or carbs than usual, then you will be retaining more water than usual. Food and water both have weight. You haven't put on 2 lbs of fat overnight.

It's fine to weigh every day if you like doing that, but you have to learn pretty quickly not to freak out every time that number goes up. I weigh every day and it goes up probably 3 days a week on average. It doesn't matter though, because the overall trend is still going down.

This!!!

No worries! It has nothing to do with actual weight gain. It has to do with the amount of water your body is retaining, as well as the amount of BM built up in your colon. We can hold anywhere from 5-6lbs in fecal matter alone. Trying upping water intake, and see where it goes from there. That should not only help with the water retention, but it should aid with cleansing your colon as well.

also, if you are close to "those" days of the month.... you can "gain" 2lbs easily... but they will go away within a week ;-)

I fluctuate up to 5lbs per day.
Measure weekly and youll see the loss for what it really is.
Measure daily and youll drive yourself crazy.

bump

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Gain! Unless you ate 7000 calories during your sleep.

Okay so I upped my calories from 1200 to 1360 (this is the goal mfp gave me). I weighed two days ago and I went up about half a lb, weighed yesterday and weight was back to normal and the half a lb gone. Weighed just now and im up by 2lbs! What? I usually weigh myself in between 9-10am.. its 10.45 now surely 45 minutes wont make a difference?! I haven't had breakfast yet because i've been to busy, but I have had half a can of diet coke, would that have effected it this much? Usually I don't drink anything before I weight myself. I'm gutted
I know I shouldn't weigh myself everyday, i've been trying not to but I was really scared this was going to happen so I wanted to try and find out before I put to much weight back on.
Yesterday I did eat quite a bit.. but I was still under my calorie goal and other goals. Hate this I had 70 days of no loss what so ever and then I finally lost nearly 5lbs in two weeks I was so happy! (eating healthily by the way wasn't cutting anything out) Now I know that even though now it would count as 3lbs in two week I know that is also good, but i've been at this since January/Febuary and only lost 18lbs.. 16lbs now that this 2lb is back on

Does anyone have any advice please?

Your body loses weight in chunks, not linear. I have found that you can do everything right and your weight loss seems to plateau but if you are patient and keep exercising and eating at a deficit (however slight) you will lose it, it will suddenly "whoosh". There are so many variables for the scale; water retention, digestion, hormones, allergies, sodium, carbs, water intake, DOMS, inflammation, the list goes on. People mistakenly think they lose or gain weight when they eat more or less because of these fluctuations.

Losing weight requires tremendous patience. You will not lose it when you want it or where you want it. The body does its thing. Some apparent plateaus can last a month or so. You cannot make it happen faster. You must focus on two things; calories and exercise. Nothing else matters. Scales and metrics don't matter. The day in and day out grind of exercise and calories are all that matters. It is not very exciting until things fall into place. You get your victories and you ride one victory to the next.

The scale is a trend tool. The scale is good but put it away and only check once a week and only use it as a trend tool. It will fluctuate, it does not matter. Take front side and back progress pictures at least once a month. You will see differences that the metrics won't tell you and it's that little bit of NSV that will keep you going until the next victory.

What is the exact number of calories for you?

We’ve been trying to figure out an exact NUMBER of calories that everyone should be eating, without recognizing that everyone is slightly different. In truth, the calories aren’t the end game. Your body is. So the EXACT amount of Calories that are right for you is the EXACT amount that will allow you to maintain your ideal bodyweight no matter what some calculator or chart says.

In other words, an online calculator might tell you that you need to eat 2,500 calories
per day to maintain your ideal bodyweight. But the only way to know for sure if this is
the right amount for you is to test it out. If you gain weight or can’t lose weight eating
that much, then you know you need to eat less to lose weight no matter how many
calculators and text books say otherwise.

This doesn’t mean your metabolism is broken, it just means the estimate of your needs
was just a bit off.

-John Barban (The Body Centric Calorie Guide from the Venus Index and Adonis Index Manuals)

I wouldn't worry about it personally. I can gain 10 pounds in a day just from water retention and lose it overnight. (It's sure a PITA running to the bathroom all night too!) I weigh in the morning before I do anything and that's my base weight for the day. Unfortunately due to the water retention I'm at a higher weight then when I started this diet. Oh, well, we'll see what I'm weighing next month. My blood sugars are improving at least.

I put my scale where I don't see it and unless I go and take it out can't weigh myself. This has kept me from weighing everyday. Maybe try it and see if out of sight out of mind might work for you....