Twenty pounds in 2 months is a fairly swift weight loss. That's over 2 lbs a week, and it may be unsafe. So be careful! It's hard to keep the motivation going, but it's not surprising that your weight loss would slow down or plateau.
Look at this as a practice for what you would do once you finish losing all the weight. Continue to track your nutrition and be sure you are getting all your nutrients, and make sure you stay within your calorie range. You can also try eating at the higher end of your range. Giving your body extra calories might actually jump-start you burning more calories and renew your weight loss.
You might want to change your exercise, either by stepping up the intensity or just trying something different. If you usually run on a treadmill, run outdoors or try a workout class or a new DVD. Your body gets used to the challenges you give it so you have to switch things up. I usually find switching things up every 6 weeks or so keeps it interesting for me.
You can do it!
My Sparkpage is set to private, but I'm open to SparkMail!
"People often say that motivation doesn't last. Well, neither does bathing--that's why we recommend it daily." - Zig Ziglar