Pregnancy Risks During Safe Period and Withdrawal Method - Obstetrics and Gynecology

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Menstrual cycles are very regular; withdrawal method during the safe period?


My menstrual cycle is very regular, always 32 days.
The app predicts the dates accurately.
If I have unprotected intercourse during the safe period and use withdrawal, what is the likelihood of getting pregnant? Thank you.

Jing, 20~29 year old female. Ask Date: 2015/07/04

Dr. Lü Lizheng reply Obstetrics and Gynecology


Most of the time, pregnancy is unlikely.
However, occasionally, ovulation can be disrupted and change, which still leaves the possibility of an unexpected pregnancy.
If you can accept the possibility of an unplanned pregnancy, then it is not a problem.
If you cannot accept the possibility of an unplanned pregnancy, you should consider finding another more effective contraceptive method, such as birth control pills, condoms, or intrauterine devices (IUDs).
Sincerely, Dr.
Lu Li-Cheng, Taoyuan Hospital.

Reply Date: 2015/07/04

More Info


When it comes to understanding pregnancy risks during the safe period and the withdrawal method, it's essential to grasp a few key concepts about the menstrual cycle, ovulation, and the effectiveness of various contraceptive methods.

Firstly, the menstrual cycle typically lasts between 21 to 35 days, with an average of 28 days. Ovulation usually occurs around 14 days before the start of the next menstrual period. For someone with a stable 32-day cycle, ovulation would likely occur around day 18 of the cycle (32 - 14 = 18). The fertile window, which is the time when a woman is most likely to conceive, generally spans from about five days before ovulation to one day after, making it roughly days 13 to 19 in a 32-day cycle.

The "safe period" refers to the days in the menstrual cycle when the likelihood of becoming pregnant is low. However, calculating this can be tricky, especially if your cycle is not perfectly regular. Even with a stable cycle, factors such as stress, illness, or hormonal changes can affect ovulation timing. Therefore, relying solely on the calendar method for contraception can be risky.

Regarding the withdrawal method (also known as coitus interruptus), it involves the male partner withdrawing before ejaculation to prevent sperm from entering the vagina. While this method can reduce the risk of pregnancy, it is not foolproof. Pre-ejaculate fluid (pre-cum) can contain sperm, and if the male partner does not withdraw in time, there is a significant risk of pregnancy. Studies suggest that the failure rate of the withdrawal method can be as high as 22% with typical use, meaning that out of 100 couples using this method for a year, about 22 will experience an unintended pregnancy.

In your case, if you engaged in unprotected intercourse during the safe period and relied on the withdrawal method, the risk of pregnancy is relatively low but not zero. If your cycle is indeed regular and you are certain that you were outside your fertile window, the chances of conception are minimal. However, if there is any uncertainty about your ovulation timing or if your cycle varies, the risk increases.

If you are concerned about the possibility of pregnancy, consider taking a home pregnancy test if your period is late. Additionally, if you find yourself frequently worried about unintended pregnancy, it may be beneficial to explore more reliable contraceptive methods, such as hormonal birth control pills, IUDs, or condoms, which can provide better protection against pregnancy.

In terms of recovery after an abortion, if you were to consider that option, it typically involves a short recovery period. Most women can return to their normal activities within a few days, but it is crucial to follow your healthcare provider's advice regarding post-abortion care. Potential side effects can include cramping and bleeding, but serious complications are rare when the procedure is performed by a qualified healthcare professional.

In summary, while the withdrawal method can reduce the risk of pregnancy, it is not entirely reliable, especially if you are unsure about your ovulation timing. If you are looking for peace of mind regarding contraception, consider discussing options with a healthcare provider to find a method that suits your lifestyle and needs.

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Dr. Zhang Kunmin reply Obstetrics and Gynecology
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Your menstrual period in May was from May 14 to May 21, and in June it was from June 15 to June 23. You had unprotected intercourse with your boyfriend on June 17, with withdrawal method used twice. Is there a possibility of pregnancy in this situation?


Dr. Cao Guotao reply Obstetrics and Gynecology
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