Is It Possible to Get Pregnant After Unprotected Intercourse?

Is it possible to become pregnant?

The last menstrual period was on January 17.
The cycle has been somewhat irregular, as I was away from the northern region and returned to the eastern region for the New Year for four to six days.
Due to the different water quality, the body's pH levels may vary.
On the night before February 4, I started to feel 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 previous sexual experience, and during intercourse, he did not penetrate deeply, lasting less than a minute, and he did not ejaculate.
I forgot if he had any pre-ejaculate fluid.
After that, we did not engage in sexual activity again.
On February 14, I bought a pregnancy test (not first morning urine), which showed negative.
On February 16, I tested again (not first morning urine), and it was also negative.
I continued testing until February 17, and all tests (including first morning urine) showed negative.
On February 15, I visited a gynecologist, where I was tested again, and the result was negative.
An ultrasound was performed, and everything appeared normal.
I started taking medication to induce menstruation on February 15, and on February 18, I received an injection to induce menstruation.
On February 19, I tested again, and it was one line (not first morning urine).
If my period is about to come, my boyfriend can smell a certain odor on me; he noticed this odor on February 16, which intensified on February 17, decreased on February 18, and then intensified again on February 19.
(Recently, I have been under some stress and often have trouble sleeping.)
1.
Is there still a possibility of pregnancy?
2.
Is the likelihood of pregnancy high?

Yu, 10~19 year old female. Ask Date: 2020/02/20

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, it seems that you are not pregnant.
It's important to use contraception at all times.
Wishing you good health.

Reply Date: 2020/02/20

More Info

When considering the possibility of pregnancy after unprotected intercourse, several factors come into play, including the timing of the menstrual cycle, the nature of the sexual activity, and the physiological responses of the body. Based on the timeline you provided, let's break down the situation.

1. Timing of Intercourse: Your last menstrual period started on January 17, and you mentioned that your cycles can be irregular, averaging between 28 to 34 days. If we assume a typical cycle length of around 28 days, ovulation would likely occur around February 1 to February 3. Sperm can survive in the female reproductive tract for up to five days, which means that intercourse on February 6 could potentially lead to pregnancy if ovulation occurred shortly after.

2. Nature of the Intercourse: You indicated that during your first sexual encounter on February 6, penetration was shallow and your partner did not ejaculate inside you. However, it’s important to note that pre-ejaculatory fluid (pre-cum) can contain sperm, and even a small amount of this fluid can lead to pregnancy. The risk is lower than with full ejaculation, but it is not zero.

3. Pregnancy Testing: You conducted several pregnancy tests, including urine tests on February 14, 16, and 19, all of which returned negative results. It’s crucial to use the first morning urine for the most accurate results, as it contains the highest concentration of the hormone hCG (human chorionic gonadotropin), which is what pregnancy tests detect. If you tested too early, it’s possible that hCG levels were not high enough to be detected, especially if conception occurred later than expected.

4. Menstrual Symptoms: You mentioned experiencing changes in odor and other symptoms that could indicate an approaching menstrual cycle. Stress and anxiety can also affect your menstrual cycle, potentially delaying your period. The changes in odor you described could be related to hormonal fluctuations or the onset of menstruation.

5. Medical Consultation: Since you have been experiencing irregularities and have taken medication to induce menstruation, it’s advisable to follow up with your healthcare provider. They can perform a blood test for pregnancy, which is more sensitive than urine tests, and can provide a clearer picture of your reproductive health.

In summary, while there is a possibility of pregnancy given the circumstances, the likelihood appears to be low based on the details provided. The negative pregnancy tests and the timing of your menstrual cycle suggest that you may not be pregnant, but if your period does not arrive as expected, a follow-up with your healthcare provider is recommended. They can offer further testing and guidance tailored to your specific situation. Remember, understanding your body and its cycles can help you make informed decisions about your reproductive health.

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