There is nothing you can do to alter your predestinated height. Your final height is based on: your parent’s height, your health status and your ethnic background. Growth tends to taper off with the beginning of puberty. For girls this is after they begin menstruation and is often earlier than in boys.
In regards to anti-estrogens and their effects on growth plate closure there is little concrete information. FX did not find any proof that they will slow growth plate closer. There are also some adverse side effects especially if you are a female. If you still would like to pursue them as an option you need to discuss this with your physician.
As far as Pilates is concerned it will not increase your height but in may help improve your self-esteem and become more comfortable and content with your current height. It is a great form of exercise.