A cryptic pregnancy, also called a pregnancy without symptoms, occurs when the usual signs of pregnancy do not appear or go unnoticed. As a result, a woman may not realize that she is pregnant.
Possible causes include irregular menstrual cycles, bleeding that may be mistaken for a period, being overweight, breastfeeding, contraceptive use, and certain psychological, family, and environmental factors. These circumstances can make pregnancy-related changes harder to recognize.
Not knowing about a pregnancy can prevent adequate prenatal care and may lead to behaviors that can be harmful to the baby. It can also increase the risk of complications for the mother and affect fetal development and health.
Main causes
The main causes of cryptic pregnancy are:
1. Physical and biological factors
Certain physical conditions can make signs of pregnancy harder to notice or cause them to be attributed to other situations:
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Irregular or absent periods: When menstrual cycles are irregular, as can occur with polycystic ovary syndrome (PCOS) or primary ovarian insufficiency (POI), a missed period may not raise suspicion of pregnancy;
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Periodic bleeding: Spotting or intermittent bleeding during pregnancy may be mistaken for a light or irregular period;
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Overweight or obesity: These can affect the menstrual cycle and may also make abdominal growth or fetal movement less noticeable;
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Breastfeeding a previous child: While breastfeeding, the absence of periods, fatigue, and back pain may be attributed to the demands of caring for a baby;
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Use of birth control or a diagnosis of infertility: Fully relying on the effectiveness of contraception or believing that pregnancy is not possible may cause pregnancy symptoms to be overlooked;
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High pain tolerance: Some women may interpret pregnancy discomfort or early contractions as cramps or mild pain and may therefore not associate them with pregnancy.
Together, these factors can cause normal pregnancy changes to go unrecognized as signs of pregnancy, which can delay its identification.
2. Psychological factors
In some cases, psychological factors can influence whether a woman recognizes changes in her body as signs of pregnancy.
Denial may act as an unconscious defense mechanism when faced with a reality that is difficult to accept, particularly when there is fear of motherhood, rejection of the pregnancy, or difficult financial or personal circumstances.
A history of trauma or violence, such as physical or sexual abuse, incest, rape, or traumatic sexual experiences or education, may also be associated with pregnancy denial.
In addition, difficulty recognizing emotions or interpreting signals from the body may cause the physical changes of pregnancy to go unnoticed.
3. Family and environmental factors
Although pregnancy denial recurring within the same family is uncommon, cases have been documented in which it occurs in several women in one family, such as a grandmother and later her granddaughter.
The situation may also be reinforced by a woman’s immediate environment when a partner, family members, or even healthcare professionals do not recognize the pregnancy, which can further delay its identification.
Signs and symptoms
In a cryptic pregnancy, a woman may not experience the typical signs or symptoms of pregnancy, or these symptoms may go unnoticed, be ignored, or be attributed to other conditions.
Symptoms such as nausea, abdominal pain, fatigue or excessive sleepiness, and increased breast tenderness are not unique to pregnancy and may be associated with other situations, including premenstrual syndrome (PMS), diet, excessive sun exposure, or sleep problems.
Why does bleeding occur during a cryptic pregnancy?
Vaginal bleeding during a cryptic pregnancy may be mistaken for a menstrual period.
However, bleeding may have other causes, such as implantation of the embryo in the uterus, which can cause small blood vessels to break and lead to light bleeding.
Because this can occur around the same time a menstrual period would normally be expected, a woman may believe that she is not pregnant.
In addition, as pregnancy progresses and the uterus increases in size, small blood vessels may break and cause bleeding, which can contribute to a woman continuing to believe that she is not pregnant.
Why doesn’t the belly get bigger?
Some women with a cryptic pregnancy may not develop a prominent belly, even though this is one of the most noticeable signs of pregnancy.
This may occur for several reasons:
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Long torso: There may be more room for the uterus to expand upward rather than outward, which can make the belly appear smaller;
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Overweight: Abdominal growth may be mistaken for weight gain;
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Strong abdominal muscles: These may make the belly less prominent and may allow the baby to develop closer to the spine.
In addition, when the fetus is very small, it may be more difficult to notice a significant change in abdominal size.
Cryptic pregnancy with a negative test
A cryptic pregnancy can produce a false-negative pregnancy test result, just like any other pregnancy.
This may occur depending on when the urine sample is collected, since urine can become more diluted throughout the day. More diluted urine can make the pregnancy hormone harder to detect, resulting in a negative test even when a woman is pregnant.
What are the risks?
Not knowing that she is pregnant may prevent a woman from receiving adequate prenatal care.
A woman may also continue behaviors that can be harmful to the baby, such as drinking alcohol, smoking cigarettes, or taking medications that are not recommended during pregnancy.
There may also be inadequate intake of nutrients that are essential for healthy fetal growth and development, such as folic acid.
This situation can increase the risk of pregnancy-related medical conditions such as gestational diabetes and preeclampsia. It may also delay the detection of genetic abnormalities or other health conditions in the baby, potentially placing both the mother and baby at risk.
After delivery, a woman may experience feelings of guilt, emotional distress, or depression. Psychological support and support from family members can therefore be important during this period.