Copper T is a very effective method of birth control used by many women. It is safe, protects from unwanted pregnancy, and can be removed if a woman desires to be pregnant again.
But like any other IUD it doesn't suit all women. Some women have heavy bleeding, discomfort, heaviness after Copper T insertion but again there are many women who are happy with it.
Best is to consult with your gynecologist and getting knowledge about it. You can go through this write-up till then.
http://www.indiaparenting.com/womens-health/166_649/copper-t.html