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FamilyPhysician
FamilyPhysician, Doctor
Category: OB GYN
Satisfied Customers: 12623
Experience:  Board certified Family Physician, 27 years experience in emergency medicine.
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I have taken plan B within 24 hours after the condom broke,

Customer Question

I have taken plan B within 24 hours after the condom broke, I believe that I was ovulating the day the condom broke. How many chances there are that I will be pregnant? Will taking another dose of Plan B can make sure that there will be no pregnancy since sperm can live in female body for up to 7 days and I am not on Birth Control pills. Moreover, I did not have sex after that single incident. Thanks.
Submitted: 5 years ago.
Category: OB GYN
Expert:  FamilyPhysician replied 5 years ago.
Did you take the Plan B as directed?

Expert:  FamilyPhysician replied 5 years ago.
Unfortunately you have logged off, so I will give an answer assuming that you took the Plan B as directed.

In studies on Plan B, the risk of pregnancy from a single episode of unprotected intercourse was reduced from 8% to about 1% with the proper use of Plan B.

It is NOT recommended to have more than one use of Plan B for any single episode of intercourse.
Customer: replied 5 years ago.
But what about sperm staying inside body for up to 7 days and I am not on birth control pills. However, i have taken plan b as directed. And i am worried that the incident occured the same day i was ovulating. does that increase the chances of pregancy? I just want to avoid pregnancy. can 2nd dose of plan b avoid pregnancy according to the way plab b works because i am worried that plan b taken once will not avoid the connection between sperm and egg for 7 days because sperm can live up to seven days inside female body. And I don't want to be on regular birth control pills and most importantly I want to avoid pregnancy. Please help!
Expert:  FamilyPhysician replied 5 years ago.
While I understand your concern, there is NO need to use another cycle of Plan B.

The earlier you take the Plan B, the lower the risk. The 1% risk included all patients including those that took the Plan B up to 72 years after unprotected intercourse.

The 1/2 life of the medication (the time that it takes for 1/2 of the dose to be eliminated from the body) is about 24 hours. For this reason - it has a prolonged duration of action. There are a number of different mechanisms of action including decreasing tubal transport.
http://www.go2planb.com/plan-b-prescribers/ec-faq.aspx#3

You can contact your physician, however, the standard of care would be to NOT recommend another cycle of Plan B
Customer: replied 5 years ago.
Out of 100 how many women can become pregnant who had unprotected sex during the ovulation phase? If Plan B take as directed within 24 hours, as most resources say that if plan b is taken within first 24 hours the chances of pregnancy is decreased by 95%. Is the percentage same for those who had unprotected sex during the ovulation phase?
Expert:  FamilyPhysician replied 5 years ago.
The approproximate risk of pregnancy around ovulation is estimated at 20 - 25%. Since you took the Plan B within 24 hours - the chance of pregnancy reduction is as you report 95%.

When you calculate the approximate risk of pregnancy in your case - you would be about 1%

25% * (100 - 95%) = 1.25%
FamilyPhysician, Doctor
Category: OB GYN
Satisfied Customers: 12623
Experience: Board certified Family Physician, 27 years experience in emergency medicine.
FamilyPhysician and other OB GYN Specialists are ready to help you
Customer: replied 5 years ago.
Thanks a lot. I have just 1 more question. Are you sure that just one dose of plan b can cut the chances of pregnancy by 98.75%, or do i need to take just 1 more pill of plan b as a precaution and back up plan since it contains same hormones that are used in regular birth control pills. I know it may not be necessary and have possible side effects but i want to make sure sperm does not reach egg as long as it is inside me. The idea of sperm can live in inside body for 5-7 days scares me. Please give me your opinion.
Expert:  FamilyPhysician replied 5 years ago.
Based on published data and the official FDA approved prescribing information there is NO recommendation (or need) to take more than the recommended single pack of Plan B.

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