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Doctor insights on: How Long Does Plan B Delay Ovulation

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How long does Plan B delay Ovulation for? (taken before Ovulation day)

How long does Plan B delay Ovulation for? (taken before Ovulation day)

LongEnoughFor Sperms: It delays long enough for sperms to die as sparms can live up to 4 days. So it is more than 4 days. Or ovulation is inhibitrd. And it can irritate the lining of the endometrium (in uterus) so implantation does not take place. This mode works even if the fertilization has taken place or will take place if you were already ovulating ...Read more

Dr. Philip Chenette
1,829 Doctors shared insights

Ovulation (Definition)

Ovulation is the act of the ovary releasing the egg after it has been hormonally prepared, to be ...Read more


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How does Plan B affect the ovulation if used before? Does it stop it altogether or delay? And if delay by how long?

How does Plan B affect the ovulation if used before? Does it stop it altogether or delay? And if delay by how long?

Typical with Plan B: Plan b essentially disrupts the normal menstrual cycle by blocking or delaying ovulation. That it is how it works and why it is so different than a medical abortion. Irregular bleeding after taking Plan B is not rare. Always check a pregnancy test after using Plan B and see a doctor to start a better form of birth control. ...Read more

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If I took a plan b pill before would that have delayed my ovulation date? If so by how long? I took it fertile days leading up too ovulation

If I took a plan b pill before would that have delayed my ovulation date? If so by how long? I took it fertile days leading up too ovulation

Wouldn't delay ovul: Plan B will not delay your ovulation. Plan B functions by preventing fertilization by altering tubal transport of sperm or egg. It may alter the endometrium (lining of the uterus) to prevent implantation which is needed for cell growth. Ovulation is the release of your eggs from the ovaries and Plan B does nothing here. So it would not delay your ovulation. ...Read more

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How long is ovulation delayed after taking Plan B and having your period?

It is not: After you have had a period, it would not matter that you had taken plan b, you would likely still ovulate about the same time. ...Read more

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How many days does Plan B delay Ovulation for?

Not Determined: The duration of effectiveness in delaying ovulation has not been determined
There is some evidence that it may be effective for 100 hoours that is 4 days
But it looses its effectiveness slowly. It works best if taken within 24 hours ...Read more

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Question: Had Protected sex May 3 plan b May 5 ovulation date May 7th Did plan B delay ovulation date to a further date? Thanks!

Question: Had Protected sex May 3 plan b May 5 ovulation date May 7th Did plan B delay ovulation date to a further date? Thanks!

Sort of...: When Plan B blocks an ovulation, one cannot predict the next date that ovulation will occur, but cycles should normalize after another monthly cycle. The simple act of taking Plan B is an enormously loud voice saying: USE RELIABLE CONTRACEPTION RIGHT NOW AND EVERY DAY. Hopefully, that is easy to do in most cases, and can eliminate the desire or need to know exactly when ovulation will happen next. ...Read more

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Does plan b cause a delay on ovulation or how does it work?

Does plan b cause a delay on ovulation or how does it work?

Prevent ovulation.: If taken at the right time, before your body sends a signal to ovulate (LH surge), EC can stop the signal and completely prevent ovulation. The follicle will likely degrade without the signal to release the egg. The EC would sustain the lining of the uterus and once that is cleared, you'll have a period. ...Read more

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If I spot after taking Plan B is it because its delaying my ovulation?

If I spot after taking Plan B is it because its delaying my ovulation?

Plan B: Plan b is used for unprotected sex with contraceptive failure. It works w female hormones. Plan b can prevent ovary from releasing an egg, thickens cervical mucus which makes it harder for the sperm to reach egg & thins the lining of the uterus to prevent implantation. Emergency contraception symptoms can include spotting or bleeding, changes in menstrual flow or your period may be late or early. ...Read more

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Plan B delays ovulation for how many days & when the days past the egg is then released?

It varies: How long ovulation is delayed by Plan B varies depending on when in the cycle you take it. At some points you could have already ovulated. You will of course ovulate again and can get pregnant so now is the time to start a more reliable method of contraception so you won't have to worry. Hope this helps. ...Read more

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How soon after Plan B does one ovulate? Should I expect ovulation to only be delayed by a few days, or does the bleeding it causes reset your cycle?

How soon after Plan B does one ovulate? Should I expect ovulation to only be delayed by a few days, or does the bleeding it causes reset your cycle?

One week: If taken at the right time, before your body sends a signal to ovulate (LH surge), EC can stop the signal and completely prevent ovulation. The follicle will likely degrade without the signal to release the egg. The EC is similar to the hormone (progesterone) that would sustain the lining of the uterus and once that is cleared, you'll have a period -- usually one week. ...Read more

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Why does websites say plan b works by causing delay on ovulation and other says it prevents ovulation im confused does it delay?

It can do both: Plan B is a high dose of hormones given all at once. The idea is to disrupt the normal hormonal balance to delay or to prevent ovulation. When used correctly it decreases the risk of pregnancy by about 70%. One can not determine in any one individual whether or not it will delay ovulation, prevent ovulation or not work during any one menstrual cycle. Use birth control to avoid this issue ...Read more

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Is it possible for Plan B taken cycle day 11 to delay ovulation till the last day of the cycle and then have a very light period the next day?

Reading Labels: Plan b will interfere, interrupt, change or wreak havoc on the menstrual cycle for two months. Why would you be monitoring ovulation after taking plan b. There can not possibly be any validity to such monitoring. ...Read more

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If you had sex 3/3 took a plan b 3/5 delayed ovulation on 3/7 (supposed to be) to another further date. Had sec 3/10 Doesn't that mean the baby's due date is different now?

R u Pregnant now?: If you are pregnant, you initially base your due date on the first day of your last menstrual period (LMP), which should have nothing to do with when you took Plan B, if your LMP preceded it. An ultrasound done during your first trimester will provide a more accurate due date. ...Read more

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Hello docs. I was wondering can withdrawal bleeding from Plan B cause ovulation to be delayed?

Hello docs. I was wondering can withdrawal bleeding from Plan B cause ovulation to be delayed?

Yes: The hormones may effect your period but if you had unprotected sex a late period might be a sign of pregnancy---check a pregnancy test and if negative wait two weeks-- if no period by then see your doctor. ...Read more

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My period is 4 days delayed and on aug 24 I took Plan B right after my ovulation day, could I be pregnant still?

My period is 4 days delayed and on aug 24 I took Plan B right after my ovulation day, could I be pregnant still?

Possible pregnancy: I am not sure how soon after sex you took plan b. It may or may not have worked. If you're in doubt, proceed with taking a pregnancy test. This should dissipate your worries. ...Read more

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How long does Plan B stay in the body? What happens if you take it before Ovulation? Will the egg come out after a few days? Thanks.

How long does Plan B stay in the body? What happens if you take it before Ovulation? Will the egg come out after a few days? Thanks.

Effectivness is 72: Hours, however the effectives tapers off with time from intercourse. So it is most effective the closer taken after intercourse and less effective as time passes. It suppress ovulation if taken before ovulation. If suppression goes away due to time pass and weakened effectiveness of the drug it is possible that the egg come out from the ovary. ...Read more

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If I had sex @ 2-4 in the morning of my ovulation day (june22) how long after can I still use Plan B pill?

If I had sex @ 2-4 in the morning of my ovulation day (june22) how long after can I still use Plan B pill?

Up to...: You take one Plan B pill within 72 hours of the unprotected sex, and the second one 12 hours later. ...Read more

Plan B (Definition)

Levonorgestrel is a women's ...Read more