Pregnancy Chances: A Teen's Guide to Safe Practices - Obstetrics and Gynecology

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Probability of Pregnancy


Hello doctor, I am 15 years old.
I had sexual intercourse with my boyfriend on March 4th using a condom.
Afterward, I checked and the condom did not break, but that day was during my fertile period.
Since then, every sexual encounter has involved withdrawal before ejaculation.
Fourteen days after the intercourse, which was the first day of my missed period, I bought a pregnancy test and it showed one line.
Now my period is four days late.
What should I do? Is there a possibility of pregnancy, or could it be that stress and staying up late have caused my menstrual cycle to be irregular?

zero, 10~19 year old female. Ask Date: 2023/03/21

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, you should not be pregnant.
Wait for another one to two weeks, and if your period still does not arrive, it is advisable to see a gynecologist.
Wishing you good health.

Reply Date: 2023/03/21

More Info


When it comes to understanding pregnancy chances, especially for a teenager who has recently engaged in sexual activity, it is crucial to consider various factors that can influence the likelihood of conception. In your case, you mentioned using a condom during intercourse, which is a responsible choice as it significantly reduces the risk of pregnancy when used correctly. Since you checked the condom afterward and confirmed it did not break, this is a positive sign regarding the prevention of pregnancy.

However, it’s important to note that no contraceptive method is 100% effective. Condoms can sometimes fail due to improper use, slippage, or breakage, even if these issues are not immediately apparent. Additionally, pre-ejaculate fluid (pre-cum) can contain sperm, which poses a risk of pregnancy if it comes into contact with the vaginal area. Given that you were in your "danger zone" or fertile window, there is a slight chance of pregnancy, but the use of a condom greatly mitigates this risk.

You mentioned that you took a pregnancy test 14 days after your last sexual encounter, which coincided with the first day of your missed period. A single line on the test typically indicates that you are not pregnant, especially if the test was taken correctly and within the appropriate timeframe. Pregnancy tests are most accurate when taken after a missed period, so the timing of your test was appropriate.

Regarding your delayed period, it is not uncommon for menstrual cycles to be affected by various factors, including stress, changes in routine, lack of sleep, or hormonal fluctuations. As a teenager, your body is still adjusting to hormonal changes, and it is possible for your cycle to be irregular, especially during times of stress or lifestyle changes. If you have been under significant stress or have had changes in your sleep patterns, these could very well contribute to your late period.

If your period does not arrive soon, or if you experience any unusual symptoms (such as severe pain, heavy bleeding, or other concerning signs), it would be wise to consult a healthcare professional. They can provide further guidance, perform additional tests if necessary, and help you understand your reproductive health better.

In terms of safe practices moving forward, it is essential to continue using reliable contraception if you choose to engage in sexual activity. Consider discussing with your healthcare provider about other contraceptive options that may suit your lifestyle better, such as hormonal birth control pills, patches, or long-acting reversible contraceptives (LARCs) like IUDs. These methods can provide more consistent protection against unintended pregnancy.

Lastly, it’s important to educate yourself about sexual health, including understanding your menstrual cycle, the effectiveness of different contraceptive methods, and the importance of regular check-ups with a healthcare provider. Open communication with your partner about sexual health and contraception is also vital for making informed decisions together.

In summary, while there is a slight chance of pregnancy given your circumstances, the use of a condom and the negative pregnancy test are reassuring. Delayed periods can often be attributed to stress and lifestyle factors, so it’s essential to monitor your health and seek professional advice if needed.

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