Intra-uterine devices (IUDs): An IUD is a copper coil fitted in the woman's womb that does not allow the sperm to meet the egg. Popularly called Copper T, it is a good alternative to hormone pills. The chemicals in the device change the uterine lining to prevent implantation of eggs. It can be effective for three to 10 years, depending on the kind of device used. The body may resent the foreign body initially, causing some pains. However, a wrongly inserted IUD could cause pelvic inflammation or puncture the uterus. Maintain good hygiene and medical care if you're using one. They are cost-effective and cost as little as Rs 400 to Rs 1,000.