Barrier Methods
Barrier methods of birth control include condoms, diaphragms, and cervical caps and block sperm from entering the uterus. With barrier methods, a form has to be used each time you have sex. Diaphragms and cervical caps require a special fitting from your doctor.
Pros: There are several pros of using barrier methods. Condoms are inexpensive and easily attainable, and are the most effective means for preventing STDs as well. These are a good option if you're having sex with multiple partners, or if you have had sex with other people in the past.
Cons: Cons of barrier methods include an increased risk of urinary tract infections for women who use a diaphragm. There is also the chance that the condom may break, rendering it ineffective and increasing your chances of getting pregnant.

The Pill
Birth control pills are one of the most popular options for preventing pregnancy. They are made of two different hormones and work by preventing ovulation. In order for the Pill to be the most effective, it must be taken every day. There are a number of different pills available, and each has different side effects and levels of hormones.
Pros: The Pill is a good option because, as a general rule, most of them have about a 96% effectiveness rate. In addition, it is a painless method and can also help to regulate periods.
Cons: Cons of the Pill include a number of side effects, depending on the pill, including weight gain, water retention, depression, and irritability. They can also be very expensive if you don't have insurance.

Vaginal Ring
Called the Nuva Ring, this is a thin flexible ring that is inserted in the vagina and releases the same hormones used in the Pill (only in a lower dosage) to decrease the chances of getting pregnant. The Ring is left in the vagina for three weeks, and then removed for 7 days for your period. You put a new ring in after the 7 days.
Pros: The vaginal ring because it is convenient. Unlike birth control pills, you don't have to worry about taking anything every day. It is also effective when used correctly, with only 1 to 2 pregnancies occurring per 100 women.
Cons: You may need another form of birth control if the ring is out of the vagina for more than 3 hours in order to increase effectiveness. The Ring is the most effective when it has been in the vagina at least 7 days.

IUD
An IUD, or interuterine device, is a flexible plastic device inserted into the vagina by a doctor. While they were considered dangerous in the past, most of them are safer to use now.
Pros: An IUD is one of the most effective forms of birth control, with a likelihood of becoming pregnant at less than 1%. They are long-lasting, most lasting on average about 5 years. In addition, they are immediately effective and can be removed at any time.
Cons: IUDs come with a number of side effects. Women who opt for the IUD often experience bad cramping and heavier bleeding during their period. In addition, an IUD is costly and can be hundreds of dollars. Removal and insertion requires doctor visits.