Pregnancy Risks: Contraceptive Methods and Timing - Obstetrics and Gynecology

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Probability of Pregnancy


My last menstrual period was from June 1 to June 5, and my cycle is relatively regular, starting at the beginning of the month.
My boyfriend has always used condoms, and I started taking the combined oral contraceptive pill for the first time on June 5 (I forgot the brand, but it's the type that you take for 21 days and then have a 7-day break).
On June 10, around noon, I had intercourse with my boyfriend, and we used a condom, but halfway through, I noticed that the condom had slipped off, meaning we were unprotected for several minutes, although my boyfriend did not ejaculate.
It is said that the oral contraceptive pill requires continuous use for more than 7 days to become effective.
What is the likelihood of pregnancy in this situation? Should I take emergency contraception? If I take emergency contraception, how should I continue with the oral contraceptive pill next time?

Lun, 10~19 year old female. Ask Date: 2020/06/10

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, you should avoid taking emergency contraceptive pills.
Wishing you good health.

Reply Date: 2020/06/10

More Info


When it comes to understanding pregnancy risks, particularly in the context of contraceptive methods and timing, it's essential to consider several factors, including the timing of your menstrual cycle, the effectiveness of the contraceptive methods used, and the specific circumstances surrounding the sexual encounter.

Based on your description, your last menstrual period (LMP) was from June 1 to June 5, and you began taking a combined oral contraceptive pill (the type that is taken for 21 days followed by a 7-day break) on June 5. You had unprotected intercourse on June 10, during which the condom slipped off, although your partner did not ejaculate.
First, it's important to understand how combined oral contraceptives work. These pills are designed to prevent ovulation, and they typically take about 7 days of consistent use to reach their full contraceptive effectiveness. Since you started taking the pill on June 5 and had intercourse on June 10, you were still within that initial 7-day window. Therefore, the contraceptive effect may not have been fully established at that time.

Regarding the risk of pregnancy in your situation, while the likelihood is reduced due to the use of the pill and the fact that your partner did not ejaculate, there is still a possibility of pregnancy, especially since the condom failure occurred before the pill had reached its full effectiveness. Sperm can also be present in pre-ejaculate fluid, which could contribute to the risk.

In terms of whether you should take emergency contraception (commonly referred to as the "morning-after pill"), it is generally recommended if there is a concern about potential pregnancy following unprotected intercourse. Emergency contraception is most effective when taken as soon as possible after the incident, ideally within 72 hours, but some types can be effective up to 5 days post-intercourse. Given that your encounter was on June 10, you should consider taking emergency contraception if you are concerned about the risk of pregnancy.

If you decide to take emergency contraception, you can continue taking your regular birth control pills as prescribed after the emergency contraception. The emergency contraceptive will not affect the effectiveness of your ongoing contraceptive method, but it is advisable to use a backup method (like condoms) for at least the next 7 days after taking the emergency contraception to ensure maximum protection.

In summary, while the risk of pregnancy in your situation is not negligible, it is also not very high due to the use of the contraceptive pill and the circumstances of the intercourse. However, if you have any concerns or if your menstrual cycle is delayed, it is wise to take a pregnancy test and consult with a healthcare provider for personalized advice and guidance. They can provide you with more information on contraceptive methods, emergency contraception, and any other concerns you may have regarding your reproductive health.

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