Effectiveness of Plan B during ovulation

Patient

Q: I'm a little worried that the Plan B One-Step may not work. Recently during intercourse (july17 at 1am) the condom broke. My last period began on July 5 and ended on July 9. I took plan b within 45 Min after intercourse but keep reading that if I was already ovulating Plan B will not work. My prior period was around June 9and also lasted 5 days. Based on my calculations I may have been ovulation on July 17. Any advice to potentially ease my mind or help me prepare would be great.

Doctor

A:   Plan B works through different mechanisms including,
- delaying or preventing ovulation,
- interfering with fertilization (inhibiting the movement of the egg or the sperm through the fallopian tube) and
- may inhibit implantation by altering the lining of the uterus.
Thus Plan B may be effective irrespective of ovulation, however if the process of implantation has already begun, this contraception may not be effective.


 

Related Q&A

Q: Either the day of ovulation or the day before me and my girlfriend were grinding naked I realized ther was Precum so ...

Q: I engaged in a sexual activity, but we didn't do sexual intercourse. But, his precum was smeared outside my vagina (n...

Q: On the day of ovulation I rubbed my penis between her but cheeks but never bellow the anus I am worried that the Prec...

Q: Hello, i have had anal sex only and im a virgin, and i havent gotten my period, its 11days late, but also i have took...

Q: I am roughly 5 to 6 weeks pregnant my last lmp was sept 16 i slept with 2 guys one was on the 7th October other was o...

 
DOCTOR ADVISORY BOARD
218

Dr. James Obaji M.D.

  • 247 Reviews
  • Family Physician
173

Dr. Suneel Sharman M.D.

  • 190 Reviews
  • Family Physician
138

Dr. Pat Golden M.D.

  • 169 Reviews
  • Cardiologist
98

Dr. Kunaal Jindal M.D.

  • 112 Reviews
  • Plastic Surgeon
CNN
BBC
MSNBC
CBS
abcNews
FoxNews