U.S. doctors online nowAsk doctors free
CA
A 21-year-old female asked:

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

1 doctor answer4 doctors weighed in
Dr. Vahe Yetimyan
General Practice 51 years experience
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.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Personalized answers
Free
Talk to a doctor
24/7 visits
$15 per month

Similar questions

A 38-year-old member asked:

What is the effectiveness of Plan B if taken during or once ovulation has occured?

1 doctor answer2 doctors weighed in
Dr. Heidi Fowler
Psychiatry 25 years experience
It is effective if: Taken within 72 hours of sexual intercourse. Plan b one-step can reduce your risk of pregnancy by up to 95% is used within 24 hours of sex. It is normally effective whether you are ovulating or not.
A 49-year-old member asked:

Can Plan B start new ovulation cycle?

1 doctor answer2 doctors weighed in
Dr. Jeff Livingston
Obstetrics and Gynecology 22 years experience
Disrupts not restart: Plan b essentially disrupts the normal menstrual cycle by blocking or delaying ovulation. 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.
A 44-year-old member asked:

If ovulating, will Plan B still work?

2 doctor answers5 doctors weighed in
Dr. Karen Jones
Obstetrics and Gynecology 37 years experience
Yes: Plan b will still work even if it is taken at the time of ovulation. Remember Plan B is most effective the sooner it is taken to the time of sex. Effectiveness goes down after 72 hours.
A 22-year-old female asked:

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

1 doctor answer2 doctors weighed in
Dr. Heidi Fowler
Psychiatry 25 years experience
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.
Cheltenham, PA
A 17-year-old female asked:

Is Plan B effective if you already or are ovulating. (if taken withing 72hrs)?

2 doctor answers6 doctors weighed in
Dr. Timothy Raichle
Obstetrics and Gynecology 22 years experience
Yes: It is still effective and must be used within 72 hours of unprotected intercourse. Expect that it will cause some breakthrough bleeding and a delay in your next cycle. Also, check a pregnancy test in about 2 weeks.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Personalized answers
Free
Talk to a doctor
24/7 visits
$15 per month
Last updated Mar 15, 2020

People also asked

Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits
$15 per month

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.