Do I have an eating disorder?

I tend to binge eat & accidentally purge. I don't starve myself and I don't vomit on purpose. I can't go more than a few weeks without vomiting. I'm 5 ft 4 in & weigh around 130 lbs. I used to weigh 115 before I got pregnant. When I gave birth almost three years ago, I weighed 174 lbs. I go to the gym so I can maintain my current weight and so I can eat whatever I want. I think I vomit because I get so full. Sometimes I don't know when to stop. I usually keep a pretty normal diet, but I find myself binging about once or even twice a week. This has been going on for years.