in need of answers about birth control

I've been taking birth control for almost 3 months now and until about a month ago all my friends, my boyfriend, and even my family have been telling me that my breasts have gotten huge. I noticed the difference also, and they're starting to get a little overbearing and embarrassing. I get a little self conscious every time someone mentions it to me. Could this just be from water weight and will it go away? What is happening to me?