Missed Period After Unprotected Sex: What to Do Next?

Pregnancy test is negative, but menstruation has not arrived yet?

Hello doctor, my girlfriend had her period on March 5.
After her period, we had unprotected intercourse on March 11, March 18, and March 25, without ejaculation inside.
On April 4, she took a home pregnancy test which showed a second line after more than ten minutes.
On April 5, she went to a clinic for an ultrasound and a pregnancy test, both of which indicated that she was not pregnant.
However, her period still has not arrived.
On April 9, she took medication to induce her period.

Yiwending Nanshi, 20~29 year old female. Ask Date: 2017/04/10

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, if you suspect you might be pregnant, it's best to wait.
It's always advisable to take preventive measures for contraception beforehand and not to rely on the safe period.
If your period is more than a week late, it is recommended to see a gynecologist.
Wishing you good health.

Reply Date: 2017/04/10

More Info

When it comes to missed periods after unprotected sex, it's essential to understand the various factors that could contribute to this situation. In your case, your girlfriend's menstrual cycle began on March 5, and you had unprotected intercourse on March 11, 18, and 25, without ejaculation inside her. You mentioned that she took a pregnancy test on April 4, which showed a faint second line, and subsequent tests and an ultrasound on April 5 indicated no pregnancy. However, her period has still not arrived, and she took medication to induce menstruation on April 9.

First and foremost, it's important to note that even without ejaculation, there is still a risk of pregnancy due to pre-ejaculatory fluid, which can contain sperm. However, the likelihood of conception is significantly lower without ejaculation. The fact that your girlfriend took a pregnancy test that showed a faint line could indicate a very early pregnancy, but since further testing and an ultrasound confirmed that she is not pregnant, it is more likely that the faint line was a false positive or an evaporation line, which can occur if the test is read too late.

Missed periods can be caused by various factors beyond pregnancy, including stress, hormonal imbalances, changes in weight, illness, or changes in routine. Stress, in particular, can have a significant impact on the menstrual cycle, causing delays or missed periods. If your girlfriend has been experiencing stress or anxiety, this could be a contributing factor to her missed period.

Taking medication to induce menstruation can sometimes help, but it is essential to consult with a healthcare provider before doing so. The use of such medications should be monitored by a doctor to ensure that they are appropriate and safe for her specific situation. If her period does not return after taking the medication, or if she continues to experience symptoms such as abdominal pain or unusual discharge, it is crucial for her to seek further medical evaluation.

In summary, while the risk of pregnancy exists even without ejaculation, the negative pregnancy tests and ultrasound findings suggest that your girlfriend is not pregnant. The missed period could be attributed to other factors, and it would be wise for her to consult with a healthcare professional if her period does not resume soon or if she has any concerning symptoms. Regular check-ups and open communication about sexual health and contraception can help prevent similar situations in the future. If you both are sexually active, considering more reliable forms of contraception, such as hormonal birth control or condoms, can help manage the risk of unintended pregnancy effectively.

Similar Q&A

Understanding Pregnancy Risks After Unprotected Intercourse: What You Need to Know

My period ended on the 27th. I had unprotected intercourse four times between July 28 and August 3, and I did not take emergency contraception afterward. What is the likelihood of pregnancy in this situation? Are there still methods available for contraception now?

Dr. Xu Junrui reply Obstetrics and Gynecology
If menstruation is usually regular, then having intercourse during the fertile window indeed poses a higher risk of pregnancy. Generally, emergency contraception should be taken within 72 hours after intercourse for optimal effectiveness, so it may already be too late for that. I...

What to Do If Your Period Is Late After Unprotected Sex?

Hello, doctor. I had sexual intercourse on March 4th without a condom, but the male partner did not ejaculate inside. On March 11th, I took emergency contraception, and the next day, March 12th, I used a pregnancy test which showed negative results. I then took two doses of a men...

Dr. Zhang Kunmin reply Obstetrics and Gynecology
A physician must not administer treatment, prescribe medication, or provide a diagnosis without a personal examination. Hello, the possibility of pregnancy exists even if ejaculation did not occur during intercourse, as pre-ejaculatory fluid may contain sperm. It is advisable t...

Concerns About Pregnancy Risk After Unprotected Intercourse: What to Do?

If your boyfriend did not ejaculate but there was some slippery fluid and there was friction near the vaginal opening, there is still a possibility of pregnancy, especially if this occurred a couple of days before ovulation. The fluid you mentioned could potentially contain sperm...

Dr. Zhang Kunmin reply Obstetrics and Gynecology
Hello, based on your description, there is a possibility of pregnancy. As long as there are active sperm in the vagina during the ovulation period, there is a chance of conception regardless of the method. I recommend that if your period is a week late, you should take a urine te...

Understanding Pregnancy Risks After Unprotected Sex: Key Insights

Having sexual intercourse with a female one day after ovulation (as estimated by an app), initially without a condom for fewer than ten times, and then using condoms for the remainder of the encounters, with ejaculation occurring through manual stimulation, raises concerns about ...

Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, the probability should be low, but you can take a pregnancy test to check. Wishing you good health.