Or to be more precise, a woman has 3.3 percent chance of conceiving twins naturally. By naturally, we mean without any kind of fertility treatment.

Research has found that underweight women are 72 percent more likely to experience a miscarriage in the first trimester when compared to women who had healthier BMIs.

Sufficient follicle stimulating hormone action is also needed for proper sperm production.

If you get the birth control shot regularly (every 12 weeks) it prevents pregnancy but you should use latex or female condom to reduce the risk of sexually transmitted infections.

Some women may experience allergic reactions to the rubber of the cervical cap or the spermicide they use. If this happens and your spermicide has nonoxynol-9, you may try a spermicide without this chemical.

The pill have been the most commonly used method since 1982.