How long have you been on this diet & caloric intake? Since before the 13th?
The 2 lbs MAY be water related.
You make a good statement ... "having MORE calories" helped with some lost poundage... keep that in mind.
Even though you are small at 5'2", @ 170 lbs your body will need more cals than 1200. Even at 120 lbs, I still feel your cal intake would be better around 13-1500, more toward the high end ESP if you are a marathon runner.
It's hard to absorb at first, but by NO MEANS do we want you to fail, we would only give advice to help you.