Why did I gain back 2 lbs after only a day on my body-building regime...?

I recently decided to try and bulk up.
After finding out I've been doing the weights wrong, I did 8 reps 3 sets of 60-70 lbs (prior of which I had been doing something entirely different) and I am 14 1/2 year old female, 5'1 1/2" tall. I was 128 lbs, and now I am 130 lbs. I was still a bit overweight, but could muscle gain be that fast?

I tried to get more protein: today I ate toast, mandarin oranges, 2 halibut fillets, a can of tuna, and some carbs (which I will be changing soon to protein as

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