The Many Types of Contraceptives...
There are many methods of contraception available today. Some of these methods have been used for centuries, while others came into wide use only in the last century.
Some contraceptives work by preventing ovulation, while others act to prevent pregnancy. The methods that prevent pregnancy tend to be more effective methods of birth control than those that prevent ovulation, because the former prevents fertilization before it happens, while the latter allows an existing pregnancy to complete its course without interruption.
If we look only at the scientific world, we can see that even the methods that prevent pregnancy have various degrees of effectiveness. This is because no two people, not even people with perfectly effective contraception methods are exactly the same.
What one person might find most effective in preventing let's say a certain disease, may not work as well against another person who has the same symptoms, or who suffers from the side effects caused by a different kind of disease. The effectiveness of different methods of birth control may also depend on whether the person using the contraception is trying to prevent implantation or conception; if so, some methods may not work at all.
One of the main types of contraception is the pill. The pill contains estrogen, progestin, or both, which act to regulate fertility and regulate menstruation. When taken during regular periods, the pill can effectively prevent fertilization from happening. However, the effects of this method of contraception decrease over time. Over the course of about three years, the pill begins to reduce its effect, and at some point it acts as a contraceptive pill, requiring women to take it once every month.
Another one of the main types of contraception is the intrauterine device (also known as the IUD). These devices are inserted into the uterus to prevent conception. A few of the most commonly used IUDs are the rhythm ring, and the Sponge. However, there are also more modern types of IUDs available such as the Mirena and Plan B, which have lower rates of failure, although they have higher rates of rate of sperm penetration.

Some other types of contraception include injections, Depo Provera, and emergency contraceptive pills. Although these methods do work on preventing conception, most do so by preventing maturation of eggs.
Most forms of birth control are not safe for use during pregnancy, because of the risk of complications during the process of pregnancy.
However, in some cases, they can be used for women who are not yet pregnant but want to limit their chances of having an early labor. For example, emergency contraceptive pills can be used before a woman gets pregnant, so that she can ensure that she has enough time to recover from labor before she is actually pregnant again.
This form of birth control is considered safe for use by most women, even those who are already pregnant, because it only suppresses the release of pregnancy hormones. Other commonly used forms of birth control that are safe for use during pregnancy include condoms and diaphragms.
If you are pregnant, and you would like to use any of the various methods of birth control mentioned above, it is very important that you talk with your doctor first. They will be able to recommend the best method of birth control that is safe for use while pregnant. They may even be able to give you some medical advice on how to use some of the more complicated forms of birth control.
In addition, your doctor will be able to tell you what birth control method is best for you, depending on the number and severity of your pregnancy symptoms.