Shouldn't I still be losing weight?

At the beginning of the year I worked out on my elliptical machine every day, going 2-3 miles a day. I also limited myself to eating 1300 calories (I'm 5'1" so that's not too little) of nutritious foods like fruits, veggies, whole grains, lean meat, fish, etc. Initially I was doing really well, losing about 2lbs a week. I've stopped working out as hard as I used to, but I'm active and on my feet all day during my job and I'm still eating healthy. I haven't lost a single pound in 3 or 4 weeks. I still have about 12lbs to lose to meet my goal. What's going on? I haven't started eating a ton and I haven't really changed anything other than using the elliptical machine. Shouldn't I still be losing weight? I don't believe the 2-3 miles jogging per day was the ONLY factor influencing my weight loss.