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Our bodies tend to lose at their own pace. Make sure your food is weighed out and what you're logging is accurate. What you already lost is awesome! Have patience

1. It is impossible to be 100% accurate with your intake, burns, and even the calcuations your goal is based off of are estimates. However, the more accurate you are the closer to your desired rate loss you will be. Make sure you are using a foodscale to weigh food and not overestimating workout burns.
2. Weightloss is not always linear. People experience water retention for a number of different reasons. You may have lost more and it is just being masked at the moment. It takes more than 2 weeks to determine a weight loss trend.
3. If your calorie target is 1200 calories that is where MFP bottoms out (because that is generally accepted as the least an adult should eat without negatively impacting health). On your profile it says you are trying to lose 35 lbs, so 2 lbs a week is actually considered a bit on the aggressive side for that goal. It is possible MFP gave you the 1200 calories because that is as low as it goes, and you would actually need to be eating less to achieve the deficit for a 2lb/week loss. If you go to goals, set goals manually, the table on the bottum left tells you how much your calcualted deficit should actually have you losing reguardless of you rate loss selection.

I use the IIFYM Calculator http://iifym.com/iifym-calculator/ to help calculate my calories, fat, protein, and carbs. It was within a few grams of what my nutritionist recommend and considerably off from what MFP suggest. MFP suggested I eat 1240 calories when, for my size, my body requires of 1500 just to have basic function. Perhaps MFP set your calories lower than your body actually needs to operate.