What am I doing wrong?

I've been serious for 4 weeks and have only lost half a pound?! Can someone please help me narrow down what I'm doing wrong?

A little history: Spring of 2012 I got serious and dropped 30 lbs over about 6 months. Exercised 4-5 days a week and cut calories to a low carb 1200 and lost weight really fast. I was doing great and enjoying being active... then I got TOO active and broke my upper left arm in a horseback riding accident in the Fall of 2012. This halted all activity (extreme sad face). After surgery and 6 months of rehab I was able to get back to the gym and focus on rebuilding muscle since I had atrophied pretty bad. Well, now over a year later I'm about 90% over the arm issue and focused again on weight loss.

At the beginning of this month I jumped back into doing the same routine as before, low carb with a daily calorie goal of 1200. I'm exercising 5 days a week, 1 or 2 of those days usually include something like kayaking, hiking or horseback riding. The other days I'm on the elliptical for at least 30 then doing a 15 min Nike Training weight program (burning est. 300-400 calories). This worked GREAT the first time around in 2012, I remember losing 3 lbs the first month - and while I know results wouldn't be as drastic this time, I was hoping for a little more.

I know I shouldn't decrease my calorie intake, but should I increase my workout times? Would a Fitbit One to help me be more precise? It seems the closer to my weightless goal the harder it is to lose, and I still want to lose about 30lbs more.