Rapid weight gain while eating at maintenance?

Anonymous
I so I'm 17 5'4" and three years ago I went from 150lbs to 122. I've managed to maintain that 122lbs for over a year and half by eating around 1700-1800 calories and exercising. All of a sudden last week I started rapidly gaining weight (like 1-2 pounds a day) and I'm now 128lbs. I even look bigger in my stomach area! I haven't changed my eating or exercise, and I'm definitely not pregnant (just sayin). So, my question is, is it even possible to gain fat at 1800 calories day? Am I eating too much? Just wondering if any other girls have had unexplained gains like this?
Rapid weight gain while eating at maintenance?
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