I would really be careful about going off the BC pill with a history of atrophy, if you have a good OBGYN he/she would be a great resource to explore alternatives that work for you. My mother went of the BC pill, even under the supervision of her OBGYN, and she ended up having a bleed that caused her to lose about 1/2 of her blood and required an emergency hysterectomy. She was very weak for months after and lost 30 pounds off her 120-pound frame, is was very scary and a really awful experience for her.
Birth control pills, which have been blamed for weight gain and the creation of "stubborn weight", have actually shown to have way a less of an impact on weight than previously believed. Especially with the low-estrogen pills, it probably has a relatively low impact on your weight.
That being said, I have been off the BC pill for two years because I found that for some reason it created a lot of depression during PMS that was starting to interfere with my life. So, hopefully you have a good OBGYN that can supervise that transition if you'd like to be off the BC pill! Otherwise, if you have a healthy lifestyle, and are a non-smoker, the BC pill may be worth the benefits you get from allowing you to lead an unhindered life.