Top Answer
User Avatar
Wiki User
Answered 2008-08-01 07:03:11

==How did THAT happen?== I have a friend whose husband did not want any children at all. So she took the Birth Control pill and he used condoms every single time they had sex. Well, they had two children, a boy and a girl. She said that she has no idea how that happend, but it did. A paternity test might offer a clue. ==General answer== If you know the failure rates for both methods you can calculate the failure rate for combining them, theoretically. Let's say Method A is 90 percent effective. That means that ten percent of the women using the method will get pregnant in any one year. Let's say Method B is only 80 percent effective, so its failure rate is 20 percent per year. The failure rate of both methods employed together, however, is the product of the failure rates, 0.1 x 0.2, or 0.02. Subtract that from one, and you get the effectiveness of the combination: 0.98. Pretty darn impressive. Of course, this assumes that the methods are compatible. Some non-latex condoms are not compatible with spermicides, so using them together could increase the failure rate.

User Avatar

Your Answer


Still have questions?

Related Questions

What is more effective in preventing pregnancy condoms or birth control pills?

Birth control pills are like 99.8% effective if taken properly and condoms are closer to 97%.

Which one works the best condoms or birth pills?

Birth control pills if taken according to instructions.

What are some different forms of birth control?

Some different forms of birth control includes birth control pills, morning-after pills, condoms, diaphragms, vasectomy for men, and sterilization for women.

Do all birth control pills protect you against chlamydia?

Absolutley not! The two things that do are: no sex or condoms. Birth control pills control the births of babies, nothing more.

Birth control methods?

Condoms, IUDs, spermicidal sprays, celibacy, pills.

How do you remove poverty?

Pass out Condoms or Birth Control pills instead of food.

How can avoid a pregnancy?

Avoiding sex :) or using contraceptives; birth control pills or condoms.

Do i still have to take birth control pills if we use a condom?

It is always good to use a backup method of birth control, even when using condoms. Condoms are the only form of birth control that also protects against STDs.

Is there any birth control options?

There are many birth control methods aside from traditional birth control pills. Some of those include: Condoms, IUD, Nuva Ring, Depo-Provera, FemCap, Diaphram, and Female Condoms.

Do you have to take the birth control pill if you use a condom?

If you use condoms you do not need to take birth control pills, because the condoms stop you from getting pregnant by stopping the sperm from entering your system.

What do women over 40 use for birth control?

Answer I don't know why you couldn't use birth control pills and if you can't there is always condoms.

What anti pregnancy kit does?

The anti-pregnancy kit will help a woman not to get pregnant. The kit has birth control pills, the day after pills, and condoms.

Does penicillin vk effect birth control pills effectiveness?

Birth ontrol pills may not work as well while you are using Penicillin-VK . To prevent pregnancy, use an extra form of birth control (eg, condoms).

How effective are birth control pills at protecting against pregnancy and STDS?

Birth control pills are quite effective for preventing pregnacy, however NOTHING but total abstinence can prevent std's. Condoms help, but there are no guarantees!!

Do you need to use a condom if on birth control?

Absolutely YES! Birth control pills only protect you from getting pregnant. Condoms, while not foolproof, will protect you from STDs.

I need birth control. Where can I get it in Dallas, Texas?

You can make an appointment with Planned Parenthood. They can write a prescription for birth control pills. They also give away free condoms.

If using condoms spermicide and birth control how likely is pregnancy?

Very, very unlikely. Condoms alone is considered 98% effective, and pills even better.

Why cant you use birth control with having blood clots?

Birth control pills increase the risk for blood clots. If you already have blood clots, birth control pills could make the clots worse. There are other birth control methods which could be good alternatives, condoms, diaphragms, shots, and IUDs.

Can a woman get pregnant when changing birth control pills?

It is possible to get pregnant when changing birth control pills. If you have not been on birth control for at least 2 months, you should use a back-up method, such as condoms, for the first week of starting your new birth control, to avoid putting yourself at risk of pregnancy.

Where can you buy birth control pills and do you have to prove you're age?

If you can, go to a free clinic to get a prescription for birth control pills. Otherwise go to a doctor to get the prescription. Then you can get the pills from any pharmacy. On a side note, condoms are still a better, easier and safer alternative

Should I use condoms or birth control?

You should definitely use something. Condoms prevent pregnancy and STDs (sexually transmitted diseases). Birth control pills only prevent pregnancy. It is possible to use both, for double protection. If you are on birth control it is a good idea to use condoms too to protect against STDs. If you do not regularly have sex, you may prefer to use condoms, but if you regularly have sex then you may prefer birth control pills. With birth control pills you would need to remember to take them every day at around the same time. Even missing just one pill can lead to pregnancy. With condoms you would need to remember to have some ready to use. Thee are many different types of birth control pills and also many types of condoms. To find out more about birth control, speak to your doctor or nurse. To discuss both options and which would be best for you then I suggest going to an advice centre where they can give you information that will help you to make a decision. You could also discuss it with your doctor or nurse.

Are you allergic to birth control pills?

I am not allergic to birth control pills.

What are the signs if wife is taking birth control pills?

Packet of birth control pills on the kitchen counter, receipts from the pharmacy for birth control pills, or your wife asking, "Have you seen my birth control pills?"

At what time of the month is it less likely to become pregnant?

No matter what, you are better off using condoms and birth control pills.

Preventions for pregnancy?

Abstinence Condoms Birth control pills IUD Diaphragm