Missed Period: Could It Be Pregnancy After Unprotected Intercourse?

Missed menstruation?

Your girlfriend's menstrual period started around January 15, and you had unprotected intercourse with withdrawal on February 13.
Since her period has not arrived by February 18, is it possible that she could be pregnant?

Niming, 10~19 year old female. Ask Date: 2016/02/18

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, the chances are low, but you cannot rely on the safe period.
It is better to take preventive measures for contraception before engaging in sexual activity.
If your period does not arrive in the next few days, it is advisable to see a gynecologist.
Wishing you good health.

Reply Date: 2016/02/18

More Info

When it comes to the possibility of pregnancy after unprotected intercourse, especially in the context of a missed period, there are several factors to consider. Based on the information provided, your girlfriend's last menstrual period (LMP) was around January 15, and you had unprotected intercourse on February 13. As of February 18, she has not yet had her period, which raises the question of whether she could be pregnant.

Firstly, it's important to understand the menstrual cycle. A typical menstrual cycle lasts about 28 days, but it can vary significantly from person to person, ranging from 21 to 35 days. Ovulation usually occurs about 14 days before the start of the next period. If your girlfriend has a regular cycle, she would likely have ovulated around January 29 to February 2. Since you had intercourse on February 13, it is possible that sperm could still be viable, as sperm can live inside the female reproductive tract for up to five days. However, if she ovulated earlier than expected, the chances of pregnancy decrease.

Given that she has missed her period, the next step would be to take a home pregnancy test. These tests are designed to detect the hormone hCG (human chorionic gonadotropin), which is produced shortly after a fertilized egg attaches to the uterine lining. The accuracy of these tests increases the longer you wait after a missed period, so if she tests too early, it could yield a false negative result.

If the home pregnancy test is positive, it would confirm pregnancy, and she should schedule an appointment with a healthcare provider for further evaluation and prenatal care. If the test is negative and her period still does not arrive, it may be advisable for her to consult a healthcare professional to explore other potential reasons for the missed period, such as hormonal imbalances, stress, changes in weight, or underlying medical conditions.

In summary, yes, there is a possibility of pregnancy given the timing of your unprotected intercourse and the missed period. The best course of action is to take a home pregnancy test and consult with a healthcare provider for further guidance. It's also important to discuss contraception options to prevent unintended pregnancies in the future.

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