Could Early Menstrual Cessation Indicate Pregnancy After Unprotected Intercourse?

Fifth day of menstruation, unprotected intercourse?

Hello, doctor.
The woman started her menstrual period on January 31, and on the morning of February 5, she engaged in masturbation with ejaculation.
In the afternoon of February 5, she had sexual intercourse and, in a moment of impulse, had unprotected intercourse with withdrawal.
The next day, February 6, her menstrual period stopped.
Is there a possibility of pregnancy in this situation? Six months ago, her menstrual cycle lasted a maximum of 38 days and a minimum of 31 days, with an average of around 35 days, and her periods usually last more than 6 days.
This time, it stopped after five days, which is concerning.
I am inquiring with the doctor.

Niming, 20~29 year old female. Ask Date: 2021/02/08

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, the chances of pregnancy should be low.
Wishing you good health.

Reply Date: 2021/02/08

More Info

The situation you described raises valid concerns regarding the possibility of pregnancy following unprotected intercourse, particularly when there is an early cessation of menstruation. To address your question, yes, early menstrual cessation can indeed indicate pregnancy, especially if it occurs shortly after unprotected sexual activity.

In your case, the timeline is crucial. The menstrual cycle typically lasts between 21 to 35 days, with ovulation occurring approximately 14 days before the next expected period. Given that the woman's last menstrual period started on January 31 and she had unprotected intercourse on February 5, it is plausible that she could have ovulated around that time, making conception possible. If fertilization occurred, it could lead to a missed period or an early cessation of menstruation.

The average menstrual cycle length you provided (around 35 days) suggests that her next period would be expected around March 7. If her period stopped on February 6, just a few days after the sexual encounter, it could be an early sign of pregnancy. However, it is also important to consider that menstrual irregularities can occur due to various factors, including stress, hormonal changes, or other health issues.

To confirm whether pregnancy has occurred, it is advisable for the woman to take a home pregnancy test. These tests are designed to detect the presence of human chorionic gonadotropin (hCG), a hormone produced shortly after a fertilized egg attaches to the uterine lining. For the most accurate results, it is recommended to wait until at least the first day of the missed period to take the test, as this allows hCG levels to rise sufficiently for detection.

If the home pregnancy test is positive, it is essential to schedule an appointment with a healthcare provider for further evaluation and prenatal care. If the test is negative but menstruation does not resume, it would be wise to consult a healthcare professional to explore other potential causes for the missed period.

In summary, early menstrual cessation can indeed indicate pregnancy, particularly following unprotected intercourse. It is crucial to take a pregnancy test for confirmation and to consult with a healthcare provider for appropriate guidance and care. Additionally, if there are concerns about future contraceptive methods or sexual health, discussing these with a healthcare provider can provide valuable information and options.

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