the Possibility of Cryptic Pregnancy: What You Need to Know - Obstetrics and Gynecology

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The likelihood or probability of a cryptic pregnancy?


Hello Doctor, my last normal menstrual period was on December 28.
My cycle is irregular, averaging 34 days.
I had sexual intercourse on January 11, and on January 26, I experienced light bleeding that lasted for six days, with the blood being brown and light red.
On February 1, a urine test was negative.
On February 3, I visited a gynecologist, who prescribed medication to induce menstruation.
I started bleeding on February 9, but the amount was still very light, brown, and light red.
On February 13, I returned to the gynecologist, who performed a transvaginal ultrasound and said it was my menstrual period.
On February 16, I took another urine test, which was negative.
On February 17, I had a blood test, and the beta-hCG level was <1.2 mIU/mL.
On February 21, I experienced lower abdominal pain and went to the hospital, where a transvaginal ultrasound showed polycystic ovaries and a retroverted uterus.
On February 23, I visited the gynecologist for a pelvic exam, and the doctor noted vaginal inflammation.
On February 24, I had another blood test, and the beta-hCG level was <1.2 mIU/mL.
Since both the urine and blood tests were negative, along with the ultrasound findings, I gradually started to ignore the situation.
However, starting from March 8, I experienced bleeding that lasted for five days, which was brown and very light, sometimes even black.
I came across some cases in the U.S.
regarding cryptic pregnancy, where pregnancy tests do not detect pregnancy until 20 weeks.
I would like to ask if there is a possibility of this happening in my case.
I apologize for the lengthy description, and thank you for your help!

Niming, 20~29 year old female. Ask Date: 2017/03/12

Dr. Huang Jianzhong reply Obstetrics and Gynecology


In Taiwan, urine tests combined with ultrasound examinations make cryptic pregnancy almost nonexistent, while the United States has a varied standard of medical care.

Reply Date: 2017/03/12

More Info


Cryptic pregnancy, also known as stealth pregnancy, is a phenomenon where a woman is unaware of her pregnancy until late in the gestation period, sometimes even until labor. This condition is rare and can be perplexing, especially when typical pregnancy tests yield negative results. Based on the details you've provided, it seems you've undergone multiple tests and evaluations that have consistently indicated that you are not pregnant.
In your case, the timeline of events is crucial. You had your last normal menstrual period on December 28, and following a sexual encounter on January 11, you experienced some light bleeding on January 26, which could be mistaken for an early pregnancy symptom or an irregular menstrual cycle. The subsequent negative urine and blood tests, along with ultrasound examinations, further support the conclusion that you are not pregnant.
Cryptic pregnancies are often characterized by the absence of typical pregnancy symptoms or the presence of symptoms that can be misinterpreted. In many cases, women may experience irregular bleeding, which can be confused with menstruation, and this seems to align with your experience of light bleeding that continued intermittently. However, the key point is that the medical evaluations you've undergone, including blood tests measuring beta-hCG levels, have consistently returned negative results. A beta-hCG level of less than 1.2 mIU/mL is considered negative for pregnancy, and this is a strong indicator that you are not pregnant.

The likelihood of a cryptic pregnancy occurring in conjunction with negative tests and ultrasounds is extremely low, particularly in a medical setting with reliable testing methods. In the United States, while there are anecdotal reports of cryptic pregnancies, the medical community generally recognizes that with proper testing, such as urine tests, blood tests, and ultrasounds, pregnancies can be detected early on.
It's also important to note that the medical standards and practices in Taiwan are quite rigorous, and the likelihood of missing a pregnancy through standard testing is minimal. If you are still experiencing unusual bleeding or other symptoms, it would be advisable to continue consulting with your healthcare provider to rule out any other underlying conditions that may be causing these symptoms.

In summary, while cryptic pregnancy is a fascinating and rare occurrence, the evidence from your medical evaluations strongly suggests that you are not pregnant. If you have ongoing concerns or symptoms, it would be prudent to discuss them further with your healthcare provider for additional insights and peace of mind.

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