Only been going to the gym a little while now, still only taking in about 900-1000 calories a day, but the last couple of days I weighed I have gained a bit. Is this normal? I am lifting now and doing cardio both.....

In a word...yes.

You're lifting weights, muscles will grow. But they won't grow forever on those limited calories. Gaining muscle is kinda like losing weight. Anyone can lose those first 10 pounds real quick. After that it gets harder. Same with gaining muscle. Keep doing what you're doing and you will start losing again. You're muscles will be tone and you'll be stronger and healthier than if you didn't do anything.

Don't weigh yourself every day. The increase in weight could be from your body retaining a little water after you workout. Yes, muscle weighs more than fat however it also burns 2x more calories than fat. The more muscle you have the more calories you'll burn. So I doubt the muscle is causing the weight gain if you are truly sticking to your calories, but you definitely need to make sure you get in enough protein to support the muscle growth.

Don't weigh yourself on a daily basis it will only drive you crazy. This gain and loose a lb or two thing is crazy and hard to comprehend even as much as others may say that it's your body adjusting or your building muscle. Which is all true. I say stay away from the scale and try measuring and you will have a better idea

I agree with the others stop weighing yourself daily and only do it once per week if not every two weeks. I work out daily at least 60 min and my wt. will vary up to 5 lbs. Meaning I can weigh in at 185 in the AM workout for 90 min and step on the scale and weigh 190 this is due to water/fluid wt or hormones in the body.

Another thing I recommend is when you are not feeling all that great because the weight is melting emmediately of or it fluctuating step back and take a look at the whole picture. I my self was having trouble and just recently I went back to my original weight and had my scale chart my progress, my jaw dropped the chart had a line drastically shooting downward and I realized how far I've come. By the way I recommend the Withings scale to everyone, it also does BMI and muscle mass and links to the computer and phone automatically.