How bad is it to be bulimic wile pregnant?

I'm just a teenager, so I won't have this issue for awile but I'm curiouse. I've been bulimic for 3 years and my doctor already knows but I just kind of lied my way out of it. I tried to stop, but I just can't. I've learned to accept that this is just how I am, but I would like to have kids someday..