Weird weight?

Okay well I went on the Atkins intro phase for 4 days. I started at 133lbs. Yesterday I was 129lbs. Today would have been the 5th day I was on it. But this morning I was 129.5lbs. So I got depressed and ate a lot like 2 scrambled eggs with cheese, a pack of cookies, pack of fritos, meal replacement south beach bar, 2 big pretzels with cheese, a bag of teddy grahams and mini oreos. Well my weight is still 129.5! Since I have been eating carbs like crazy coming from the atkins I thought I would gain weight. Should I go back on the intro phase in a few days will I lose weight again if I do? Also I'm 16 and 5'2.