Well, there are two possibilities that I think it could be:

1. You've started exercising, so you think you can eat a lot more. I've done this plenty of time before.  Pay attention to the number of calories you're eating.  It's true that you should eat more than usual when you exercise, but lifting weights for a while doesn't make it so you can eat a bunch of brownies (I learned this the hard way).

2. You're probably gaining muscle mass, which weighs more than fat.  Also, I took an English class with a girl to did a research project on this, and she said that as you gain muscle mass, it pushes the fat out, so you look fatter, although your fat mass hasn't changed, but that only lasts for a short time.  In the long run, gaining muscle mass is a great way to help you lose weight because it increases your metabolism because muscle requires more calories to be maintained than fat.

Keep up the weight lifting; it's a great thing to do for your body, and if you keep it up, you won't have the problem of lost muscle as you get older, which will be a huge benefit to you. 

P.S. From what I can see of you in your picture, you look beautiful; be nice to yourself about the way you look.  Be healthy and let yourself be happy; your confidence will make you look far better than your worry ;)

I agree with Cristine. you look great and healthy. Enjoy the shape you have and the strength you're getting. Maybe in a bit you'll start losing more as the muscle burns more effectively...good luck!

To be honest with you, exercise doesn't do much for me either (in terms of weight loss). But I recently started going to the gym more.. and I just like the way it makes me feel! My body's more energetic and I have greater muscle tone.

You should definitely keep working out, but that doesn't mean you can stop watching what you eat. Make sure your diet is balanced, drink lots of water to flush out toxins, and you should be fine!

Maiden, listen to Liz.

One thing I see in these posts is a complete loss of the big picture.  People can't expect to see exercise results in a week or two.  The only thing you can get in a week is gratification that you are doing the right thing for your long-term health.  You mentioned that you are eating 1100 calories a day.  To me, that seems pretty low.  One day, fine.  You weren't hungry.  But on average?  Not a good idea.  You've gained a couple pounds, on 1100 calories a day.  That has to be water retention, it can be nothing else.  Put it this way.  If you were to completely shut down an average person's metabolism so they burn zero calories, to gain 2 lbs in two days they would have to take in 7000 calories over that two day period.  As Homer Simpson once said "In this house, we obey the laws of PHYSICS!!"  My guess is, your body is stressed already (no periods) and you are stressing it further by starting to exercise again.  For some reason, your body's response to that is to retain water.  I'm not going to tell you how much to eat and how hard to work out, but I'll suggest that you're not eating enough.  That's the downside to calorie counting and a common thread in these forums.  Less calories is not always better.  Listen to Liz's advice, and good luck!!!