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Doctor insights on: How Well Does Emergency Contraception Work To Prevent Pregnancy

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How well does emergency contraception work to prevent pregnancy?

How well does emergency contraception work to prevent pregnancy?

89 %: Plan b or emergency hormonal contraception is almost 90% effective if it is used within 72 hours of intercourse, and there has only been one ejaculation in that time frame. ...Read more

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Dr. Jeffrey Stevens
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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How long does it take for birth control pills (portia) to start working ? & also how long does it take to help prevent future ovarian cyst ?

How long does it take for birth control pills (portia) to start working ? & also how long  does it take to help prevent future ovarian cyst  ?

Short time: Contraceptive pills are most likely effective within 1-2 weeks of beginning. However, it is safest to use a backup method during the first cycle, unless you're starting the pills immediately during a normal menses. Not all ovarian cysts are suppressed no matter how long you are taking the pill. There should be some suppression of cysts beginning with the second cycle. It may not work for you. ...Read more

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How long do I have to take birth control for it to be effective to prevent against pregnancy? Does this go for every brand or birth control?

How long do I have to take birth control for it to be effective to prevent against pregnancy? Does this go for every brand or birth control?

1 cycle: To be on the safe side you should be on birth control pills for 1 cycle before you can count it to prevent pregnancy. Don't forget that it's a good idea to continue using condoms always to prevent std's. ...Read more

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How does the morning after pill work (Levonorgestrel) work to prevent unwanted pregnancy?

How does the morning after pill work (Levonorgestrel) work to prevent unwanted pregnancy?

Prevents ovualtion: It delays the release of an egg from the ovary. Since there is no egg to be fertilize by the sperm, a pregnancy doesn't occur. ...Read more

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How fast does a combination birth control pill work to prevent pregnancy?

How fast does a combination birth control pill work to prevent pregnancy?

7 days: I typically tell my patients that after taking the birth control pill straight for 7days, they should be protected in terms of having unprotected sex. Of course, at 19, you should still be worried about STD's which typically means using a condom to help prevent exposure to syphilis, herpes, chlamydia, gonorrhea and HIV. Hope that helps ...Read more

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How to use emergency contraception pills after 48 hours of intercourse if want to prevent pregnancy. How many to eat and after meal or what?

How to use emergency contraception pills after 48 hours of intercourse if want to prevent pregnancy. How many to  eat and after meal or what?

You can eat whatever: you. The following will tell you what you can take, timing for each, etc: http://ec.princeton.edu/questions/dose.html#dose ...Read more

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Can birth control pills be be used as emergency contraception? if so, how much and how, and when exactly? thanks

Can birth control pills be be used as emergency contraception? if so, how much and how, and when exactly? thanks

Some can be.: But not all are a good choice. Check reference chart to see which oral contraceptives can be used for emergency contraception and at what doses. http://ec.princeton.edu/questions/dose.html#dose ...Read more

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How long does birth control pills work until they are in effect and i wont need to use condoms?

How long does birth control pills work until they are in effect and i wont need to use condoms?

Birth Control: Hello AndreaA299. Some package inserts advise protection after 7 days but I advised condoms for at least a month after initiating a contraceptive. For maximum protection against pregnany and the only available protection against sexually transmitted diseases, I suggest condom use each and every time even after that first month. For consults, my link is healthtap.com/vanessanealmd code PNYTKV. ...Read more

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How does estrogen work to prevent fertilization in contraceptive pills?

How does estrogen work to prevent fertilization in contraceptive pills?

Prevents Egg Growth: Great question. Estrogen inhibits a hormone called FSH which usually helps grow an egg. But the Progesterone part of birth control prevents ovulation and makes the inside of the uterus thinner to prevent pregnancy. ...Read more

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Can amoxicillin make birth control less effective ? If so how long should you use the back up method ?

Can amoxicillin make birth control less effective ? If so how long should you use the back up method ?

It may: Antibiotics can minimally decrease the effectiveness of the bc, so it best to use condoms while on the antibiotics and a few days after stopping them, good luck. ...Read more

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How does emergency contraception work?

How does emergency contraception work?

Several: It may prevent or delay ovulation, interfere with fertilization, or prevent implantation. ...Read more

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How important it is to take ocps with spironolactone , if i'm already using alternate method of contraception? Does ocp do long term harm to the body

How important it is to take ocps with spironolactone , if  i'm already using alternate method of contraception? Does ocp do long term harm to the body

Varies: If a woman conceives while taking spironolactone - she just needs to stop that medication when she finds out she is pregnant. If you are using birth control already you do not need the pill as well. There is a slight increase in the risk for a DVT while using the pill, otherwise the pill does not do any harm to the body in the short or long term. ...Read more

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How effectively does emergency contraceptive work?

How effectively does emergency contraceptive work?

That depends on the: One you use. Plan b one-step can reduce your risk of pregnancy by up to 95% if used within 24 hours of sex. ...Read more

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Is the pill Norethindrone Acetate usable as an effective birth control? If so what exactly does it do to prevent pregnancy?

Is the pill Norethindrone Acetate usable as an effective birth control? If so what exactly does it do to prevent pregnancy?

Progestin: This is a progesterone mimicker. Its mechanism of action is to inhibit secretion of gonadotropins from pituitary gland and prevent lollicular matuaration. and ovulation. Other effects are to stimulate growth of mammary tissue. Many women will have some irregular bleeding with progestin like products. ...Read more

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How effective is an emergancy contraceptive pill like plan b? How fast do I need to take it for the maximum effect?

How effective is an emergancy contraceptive pill like plan b? How fast do I need to take it for the maximum effect?

Take it as soon as: possible after the episode with failed birth control. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes. ...Read more

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Are emergency contraceptives really helps to avoid pregnancy?

Are emergency contraceptives really helps to avoid pregnancy?

Yes if used in: a timely manner. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes. ...Read more

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How soon can you take a pregnancy test? Also how do u know if ur birth control failed

How soon can you take a pregnancy test? Also how do u know if ur birth control failed

Fairly soon: This varies a little from test to test, but typically around the time you missed your period or just after. The package inserts or even the box for each test tend to let you know how sensitive they are or how early the earliest they can detect a pregnancy is. The answer to the second question is that if your test is positive the birth control failed. If in doubt your doctor can do a blood test. ...Read more

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Dr. Jeff Livingston
2,394 doctors shared insights

Contraception (Definition)

Contraceptiion is a means of preventing conception (or fertilization). There are hormonal and non hormonal methods of preventing sperm and egg from meeting. Talk to your doctor or clinic about what options are best for you. There are short acting methods (condoms, pills, patch, ring) and long ...Read more


Dr. Heidi Fowler
640 doctors shared insights

Emergency Contraception (Definition)

Emergency contraception is the method a woman can use to avoid getting pregnant, after she has received sperm in her vagina. She takes the hormone pills, which are usually larger doses of hormones used in oral birth control pills, within a short time (days) after her sexual activity, ...Read more