Is Pregnancy Possible After Unprotected Intercourse? A Medical Inquiry

Is it possible to become pregnant?

The last menstrual period was on January 17.
The cycle has been somewhat irregular, as I spent four to six days in the eastern part of Taiwan for the New Year, which may have affected my body's pH levels due to different water quality.
On the evening before February 4, I started feeling like having sexual intercourse.
On February 4, my boyfriend only used his fingers vaginally.
On February 6, we had intercourse for the first time without a condom.
Neither of us had prior sexual experience, and during intercourse, he did not penetrate deeply, and it lasted less than a minute.
He did not ejaculate, and I can't recall if there was any pre-ejaculate fluid.
After that, we did not engage in sexual activity again.
On February 14, I bought a pregnancy test (not using first morning urine), and it came back negative.
On February 16, I tested again (not using first morning urine), and it was also negative.
Up until February 17, I continued to test negative for pregnancy (using first morning urine).
On February 15, I visited a gynecologist, where I was tested again, and the result was negative.
An ultrasound was performed, and nothing abnormal was found.
I started taking medication to induce menstruation on February 15.
On February 18, I returned for a follow-up and received an injection to induce menstruation.
On February 19, I tested again, and it was one line (not using first morning urine).
On February 20, I tested with first morning urine and got one line, and the same result on February 21 and February 22.
On February 22, I returned for another test, which also showed one line, and another ultrasound was performed with no findings.
I received a second injection to induce menstruation and continued taking the medication until February 25.
As of now, February 27, I still have not had my period.
Is there a possibility of being pregnant?

Yu, 10~19 year old female. Ask Date: 2020/02/27

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, it seems you are not pregnant.
Wait another week, and if your period still hasn't arrived, it is advisable to see a gynecologist.
Wishing you good health.

Reply Date: 2020/02/27

More Info

Based on the timeline and details you've provided, it appears that the likelihood of pregnancy is quite low, but let's break down the situation for clarity.

1. Menstrual Cycle and Ovulation: Your last menstrual period started on January 17, and you mentioned that your cycle can be irregular, lasting anywhere from 4 to 6 days. Typically, ovulation occurs about 14 days before the start of your next period. If we assume a standard cycle of around 28 days, ovulation would likely have occurred around February 1. However, since your cycle is irregular, this could vary.

2. Timing of Intercourse: You had unprotected intercourse on February 6, which is a few days after the estimated ovulation period. Sperm can survive in the female reproductive tract for up to five days, so if you ovulated later than expected, there is a small chance that sperm could still be viable.

3. Pregnancy Tests: You have taken multiple pregnancy tests, including some with morning urine, which is typically the most reliable time to test due to higher concentrations of hCG (the hormone detected in pregnancy tests). All tests returned negative results, which is a strong indicator that you are not pregnant. The fact that you have had consistent negative results over several days further supports this conclusion.

4. Medical Consultation: You mentioned visiting a gynecologist, where you had an ultrasound and additional tests that also indicated no signs of pregnancy. This is a critical step, as healthcare professionals can provide more definitive answers based on clinical evaluations.

5. Hormonal Medications: You have been prescribed medication to induce menstruation, including injections. These medications can affect your menstrual cycle and may delay your period, especially if your body is adjusting to hormonal changes. It’s not uncommon for menstrual cycles to be disrupted after hormonal treatments.

6. Current Symptoms: As of February 27, you have not yet had your period. This could be due to the hormonal treatments you are receiving, rather than an indication of pregnancy. Stress, changes in routine, and hormonal fluctuations can all contribute to delayed menstruation.

In summary, while there is a slight possibility of pregnancy due to the timing of intercourse relative to ovulation, the consistent negative pregnancy tests and medical evaluations strongly suggest that you are not pregnant. If your period does not arrive soon or if you have concerns about your menstrual cycle or potential pregnancy, it is advisable to follow up with your healthcare provider for further evaluation and guidance. They can provide insights into your hormonal health and help manage any irregularities in your menstrual cycle.

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