If a woman decides to have children in the future then she can go for Intra Uterine devices called IUD's. In India they are more commonly called Copper T's. This is a T shaped copper structure made of copper wire and is inserted in the uterus by your gynecologist. It requires no surgery and is done in the clinic in about 15- 20 minutes. The T – shaped structure sits in your uterus and it can last up to 5 years these days. Copper usually kills the sperms when they come in contact with the IUD. Alternatively, the IUD in position does not allow the fertilized eggs to implant in the uterus too. This is relatively a cheaper and reversible contraceptive. But it is better to have it inserted after you have at least one child though not necessarily. You might experience a light cramping in your legs while the doctor inserts it. After an hour or so you will be back to normal. It does not interfere with your monthly periods. There will be a thread hanging out of the copper T through your cervix. Don't worry if you cannot see or feel it. When you want the IUD to be removed you can ask your doctor to just pull it off. This is not painful either. This mechanical method is best for women who forget to take the hormonal pills on time which will be discussed next.
Hormonal Methods:

This method is to take certain pills that contain the hormones estrogen and progestin. They are usually taken daily for 21 days followed by a one week, no pill week (7 days). This no pill week is the time you will have your monthly periods. So after these 7 days that is on the 29th day you will again start taking the contraceptive pills. The main thing here is, you have to remember to take the pill daily and on the same time of the day. If you alter the timings by more than 3 hours differences(later), the efficacy of the contraception is reduced. These pills are safe to use if you don't have a history of blood clotting and if you are not obese since these pills alter your hormonal levels. Recently, hormonal injections are in the market and have to be taken once in 3 months. These are slightly expensive but if you are very forgetful in taking the pills on time this is better option. Also a new type of IUD with hormones is implanted in the uterus which has the same effect and can last up to 5 years.