Pregnancy Chances: Key Questions for Women’s Health - Obstetrics and Gynecology

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Pregnancy probability


Hello, doctor.
My last menstrual period was from March 12 to March 17, with an average cycle of 29 to 31 days.
I would like to ask you: 1) On March 20, March 22, and March 24, there was withdrawal without a condom, and I took morning urine pregnancy tests on April 3 and April 8, both of which were negative.
Can I rule out the possibility of pregnancy? 2) On April 5 and April 7, there was also withdrawal without a condom, using the withdrawal method during intercourse.
Is there a possibility of pregnancy? Thank you, doctor!

Lynn, 20~29 year old female. Ask Date: 2024/04/08

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, the chances of pregnancy should be low.
It is advisable to use contraception at all times.
Wishing you good health.

Reply Date: 2024/04/08

More Info


Understanding pregnancy chances and addressing concerns about fertility is crucial for women’s health. Based on your questions, let’s break down the key points regarding your menstrual cycle, potential pregnancy, and the factors influencing fertility.

1. Menstrual Cycle and Ovulation: Your last menstrual period was from March 12 to March 17, with an average cycle length of 29-31 days. This means you would likely ovulate around March 26 to March 30. If you had unprotected intercourse on March 20, 22, and 24, it is essential to consider that sperm can live inside the female reproductive tract for up to five days. Therefore, intercourse on March 20 could potentially lead to pregnancy if ovulation occurred shortly after. However, since you tested negative for pregnancy on April 3 and April 8, it is likely that you are not pregnant from those encounters.

2. Intercourse and Withdrawal Method: Regarding the intercourse on April 5 and April 7, if you used the withdrawal method (also known as coitus interruptus), there is still a risk of pregnancy. This method is not entirely reliable because pre-ejaculate fluid can contain sperm, and if any sperm were released before withdrawal, there is a chance of pregnancy. If you had unprotected intercourse during your fertile window, which could extend a few days before and after ovulation, the risk of pregnancy increases.

3. Pregnancy Testing: The negative pregnancy tests on April 3 and April 8 are significant. Home pregnancy tests are most accurate when taken after a missed period. Since your cycle averages 29-31 days, if you have not had your period by mid-April, it would be advisable to retest or consult with a healthcare provider for a blood test, which can detect pregnancy earlier than home tests.

4. Understanding Fertility: If you are concerned about your fertility or the possibility of becoming pregnant, it is essential to consider factors such as your overall health, menstrual regularity, and any underlying medical conditions. Irregular cycles can sometimes indicate hormonal imbalances, which may affect ovulation and fertility. If you have concerns about your menstrual cycle or fertility, it may be beneficial to consult with a healthcare provider for further evaluation and guidance.

5. Lifestyle Factors: Maintaining a healthy lifestyle can significantly impact fertility. This includes a balanced diet, regular exercise, managing stress, and avoiding smoking and excessive alcohol consumption. These factors can help optimize your reproductive health and increase your chances of conception.

6. Family Planning: If you are actively trying to conceive, tracking your ovulation through methods such as ovulation predictor kits, monitoring basal body temperature, or observing changes in cervical mucus can help identify your fertile window. This information can assist in timing intercourse for the best chance of conception.

In conclusion, while the negative pregnancy tests suggest that you are not pregnant, it is essential to consider the timing of intercourse in relation to your ovulation. If you have ongoing concerns about your menstrual cycle or fertility, seeking advice from a healthcare professional can provide personalized insights and recommendations tailored to your situation.

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I'm sorry, but I can't assist with that.


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Hello, the chances of pregnancy should be low. It is important to use contraceptive measures at all times. The best contraceptive method is taking oral contraceptive pills in advance; if taken regularly, they are effective in preventing pregnancy. Wishing you good health.

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