Pregnancy Signs of Pregnancy Pregnancy Symptoms Can You Be Pregnant With No Symptoms? A small percentage of people have made it to 20 weeks with no pregnancy symptoms except a missed period. Learn what doctors say about this phenomenon. By Maria Carter Updated on May 21, 2023 Medically reviewed by Kiarra King, M.D. Share Tweet Pin Email In This Article View All In This Article Can You Be Pregnant and Not Know It? Who Is Affected? What Are the Risks? Imagine finding out you're pregnant—and that you conceived five months ago. It sounds unfathomable, but being pregnant with no symptoms except a missed period is possible. In fact, it has a name: "cryptic" or "stealth" pregnancy. A cryptic pregnancy is especially possible for people with irregular menstrual cycles, who may be less likely to notice when they've actually missed a period. Couple that with no morning sickness or other noticeable physical anomalies, and you can see how some people might miss a pregnancy until several weeks or months in. Read on to learn who is most likely to miss pregnancy symptoms and whether there are any risks related to being pregnant with no pregnancy symptoms. When Do Pregnancy Symptoms Start? Can You Be Pregnant and Not Know It? According to research, 1 in 475 people may not realize they're pregnant until 20 weeks, and another 1 in 2,500 only learn they're pregnant once they're in labor. This delayed realization might occur due to a cryptic pregnancy or pregnancy denial. What About Pregnancy Tests? In the case of both cryptic pregnancy and pregnancy denial, you will get a positive pregnancy test despite having not identified pregnancy symptoms, though you may not take a test to confirm because of the lack of symptoms. Cryptic pregancy It's not uncommon to have no pregnancy symptoms in the four to six weeks after your last period. Doctors date pregnancy to the first day of the last menstrual period (LMP). This number is technically off by about two weeks because most people know the day of their last period (which is typically about two weeks before ovulation), but they don't know the day of conception, says Jane van Dis, M.D., OB-GYN and medical director at Maven Clinic, the largest telemedicine network in women's and family health. With a cryptic pregnancy, this lack of pregnancy symptoms extends beyond the first six weeks. A cryptic pregnancy might occur because: The person doesn't have or doesn't notice pregnancy symptoms.The person mistakes pregnancy symptoms for other things.The person's pregnancy "bump" isn't very noticeable. While rare, it's also possible to go on to experience a cryptic or stealth pregnancy after getting a false negative result on an at-home pregnancy test, which is possible if the test was taken too early in the pregnancy, the test was taken incorrectly, or the test was expired or defective. Pregnancy denial According to researchers, pregnancy denial is when a person does not notice they're pregnant and lacks "objective perceptions of the pregnancy." Denial of pregnancy is more likely to happen with those who don't want to be pregnant or who are not ready to have a child, especially teenagers and people with substance use disorders. "I haven't done a lot of research into it, but it seems to me, for someone to not know they're pregnant until labor, there's a mixture of physiology—wherein there really were very few or no signs of pregnancy—and mental health issues," says Dr. van Dis. "There is such a distinct difference between a belly full of food or bloating in the intestines and the belly that develops over the course of pregnancy because there's a gestating baby inside," Dr. van Dis adds. Can You Notice Signs of Implantation After Conceiving? Who Is Most Likely to Miss Pregnancy Symptoms? Every pregnancy is different. Some people will check off every early pregnancy symptom on the list while others may not feel much different at all. Some people are more at risk for not experiencing or missing pregnancy symptoms. According to researchers, people who are at higher risk of missing pregnancy symptoms include: People with irregular periodsPeople with polycystic ovary syndrome (PCOS)People of young maternal agePeople with lower education and socioeconomic statusPeople who didn't intend to get pregnant The people most likely to miss pregnancy symptoms are those with irregular periods. "The patients I've cared for who've experienced this almost always report that their periods are irregular. They're not surprised or investigating if, for instance, they've missed their period for two, three, or even four months," says Dr. van Dis. Irregular cycles Many people's first pregnancy symptom is a missed period. But if your cycles are irregular, identifying a missed period can be tricky. If, for example, you experience implantation bleeding, you may think that you had a lighter-than-usual period and not notice your missed period. If your breasts are tender around the same time, you may write it off as PMS rather than a sign of early pregnancy. And lots of things, including stress, can lead to fatigue. In the same vein, people who recently gave birth, people who use hormonal birth control, and people who are in perimenopause may also be more likely to miss early pregnancy symptoms because of irregular cycles. PCOS According to Dr. van Dis, people with PCOS can go months on end without a period making it more difficult to spot a missed period. On the flip side, some have bleeding intermittently throughout the first trimester and even into the second trimester. Light vaginal bleeding or spotting can be a symptom of pregnancy, so if they have no other signs, they may attribute the bleeding to an irregular cycle. A menstrual cycle is an important vital sign, says Dr. van Dis. Providing your doctor with a thorough menstrual cycle history offers insight into your reproductive organs and hormonal status. 7 Reasons for a Late Period (That Aren't Pregnancy) webphotographeer/Getty Images Are There Risks Associated With Being Pregnant With No Pregnancy Symptoms? Delayed prenatal care is the most significant risk associated with a lack of pregnancy symptoms. Researchers say not knowing you're pregnant may also mean you continue to engage in high-risk behaviors (like drinking or smoking, for example), leading to a greater chance of poor pregnancy outcomes. A lack of pregnancy symptoms does not make you more likely to experience a miscarriage. Even though science has confirmed that morning sickness is a good sign, there is no evidence that the lack of symptoms makes a pregnancy more risky. That said, if you previously had pregnancy symptoms and then you lose them, this can sometimes be a sign of miscarriage, but not always. So, it's essential to report the loss of pregnancy symptoms to a health care provider right away. Key Takeaways While rare, you can be pregnant with no symptoms besides a missed period. People most likely to experience pregnancy with no symptoms are those with irregular periods who might not notice a late or absent period. In these cases, you may write off mild early pregnancy symptoms as other things, like PMS, gastrointestinal issues, or even stress. The biggest risk associated with a cryptic pregnancy is delayed prenatal care, so if there is any chance you may be pregnant, consider taking a pregnancy test to be sure. Was this page helpful? Thanks for your feedback! Tell us why! Other Submit Sources Parents uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Denial of pregnancy—A literature review and discussion of ethical and legal issues. Journal of the Royal Society of Medicine. 2011. Pregnancy denial and early infant development: a case-control observational prospective study. BMC Psychol. 2019. Trends in timing of pregnancy awareness among US women. Maternal Child Health Journal. 2017.