Learn more: Choosing the right birth control pill ». Most gynecologists will wait to insert your IUD until the week of your expected period. If your IUD is inserted at any other time of the month, you should use a back-up barrier method for the next seven days. Learn more: Choosing between IUD types ». If your first dose is administered after this time frame, you should continue to use a back-up barrier method for the next seven days.
If you choose to have sex during that window, use a secondary form of birth control. If you start using the vaginal ring at any other time of the month, you should use back-up birth control for the next seven days. Both male and female condoms are effective right away , but they must be used correctly to be the most successful.
This means putting the condom on before any skin-to-skin contact or penetration. Right after ejaculation, while holding the male condom at the base of the penis, remove the condom from the penis and dispose of the condom.
You must also use a condom each time you have sex to prevent pregnancy. As a bonus, this is the only type of birth control that can prevent the exchange of STIs.
Check out: How to use condoms properly ». Diaphragms, cervical caps , and sponges also start working right away. To be the most effective, these forms of birth control need to be used properly and fit well. Home About MyHealth. Include Images Large Print. Take 1 pill right away this might mean you take 2 pills on the same day. Continue to take 1 pill every day until the end of the pack. Use a backup form of birth control e. Get emergency contraception as soon as possible if your backup form of birth control fails e.
Continue to take 1 pill every day until you finish your hormone pills. You might have spotting or miss your period this month.
Standard and effective barrier methods of birth control include male condoms, the female condom, or a diaphragm. According to the University of California San Francisco Medical Department, a condom is the most common and effective method of the three, when used correctly.
It is the most effective way to prevent transmission of HIV. It's important to remember that birth control pills do not prevent sexually transmitted infections. If there is a chance that you or your partner might have an STI, you should use a barrier method even if your birth control is working to prevent pregnancy.
If you're taking birth control for reasons other than contraception, including acne, polycystic ovary syndrome, or endometriosis, it could take 2 or more months to begin taking effect. The exact length of time will depend on your body and the severity of your condition, so it's best to talk to your doctor to understand better how birth control will affect you.
However, when it comes to preventing pregnancy, with a little information about your cycle and the type of birth control you're using, we can narrow down when your birth control starts being effective. Some methods even begin working immediately. The time it takes for a birth control pill to work depends on the type of pill and where you are in your menstrual cycle when you first take it. If your birth control pill is a combination pill that contains both estrogen and progestin, the pill will be effective right away as long as you take it within 5 days of the start of your period.
If you start taking a combination pill during any other part of your menstrual cycle, the pill will begin to work after 7 days.
Make sure to use a back-up barrier method during those 7 days. If you take a birth control pill that only contains progestin, it will take effect 48 hours after taking the first pill, no matter where in your cycle you begin taking it. During those 2 days, you should use a back-up barrier method to prevent pregnancy.
You have to wait to have sex after beginning the pill or use a condom because the medication mainly works by preventing ovulation—the ovaries are kept from releasing an egg, so there'll be nothing for sperm to fertilize. Depending on the type of pill you use, it might also thicken the mucus in your cervix making it difficult for sperm to swim through and get to the egg.
Birth control pills can also prevent the lining of your uterus from thickening which is necessary to provide a fertilized egg a place to implant and grow. When you have your period, the lining of the uterus and the egg released at the start of that cycle wash away and out of your body, so there's no egg to fertilize, and your uterus isn't ready to accept a fertilized egg even if there was one.
At other points in your cycle, your body has already released an egg, and your uterus prepares for a potentially fertilized egg. If you have just had a baby and are not breastfeeding, you can most likely start the pill on day 21 after the birth but you will need to check with a doctor.
You will be protected against pregnancy straight away. If you start the pill later than 21 days after giving birth, you will need additional contraception such as condoms for the next 7 days.
If you are breastfeeding, you're not advised to take the combined pill until 6 weeks after the birth. If you have had a miscarriage or abortion , you can start the pill up to 5 days after this and you will be protected from pregnancy straight away.
If you start the pill more than 5 days after the miscarriage or abortion, you'll need to use additional contraception until you have taken the pill for 7 days. Some medicines interact with the combined pill and it does not work properly. Some interactions are listed on this page, but it is not a complete list.
If you want to check your medicines are safe to take with the combined pill, you can:. The antibiotics rifampicin and rifabutin which can be used to treat illnesses including tuberculosis and meningitis can reduce the effectiveness of the combined pill. Other antibiotics do not have this effect. If you are prescribed rifampicin or rifabutin, you may be advised to change to an alternative contraceptive.
If not, you will need to use additional contraception such as condoms while taking the antibiotic and for a short time after. Speak to a doctor or nurse for advice. The combined pill can interact with medicines called enzyme inducers. These speed up the breakdown of hormones by your liver, reducing the effectiveness of the pill. A GP or nurse may advise you to use an alternative or additional form of contraception while taking any of these medicines.
There are some risks associated with using the combined contraceptive pill. However, these risks are small. The oestrogen in the pill may cause your blood to clot more readily. If a blood clot develops, it could cause:. The risk of getting a blood clot is very small, but your doctor will check if you have certain risk factors before prescribing the pill.
The pill can slightly increase the risk of developing breast cancer and cervical cancer. It can also decrease the risk of developing womb uterus cancer , ovarian cancer and bowel cancer.
However, 10 years after you stop taking the pill, your risk of breast cancer and cervical cancer goes back to normal. Contraception is free to everyone through the NHS. Places where you can get contraception include:. Find a sexual health clinic. If you need contraception, call your GP surgery or a sexual health clinic as soon as possible. Only go in person if you're told to.
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