The condition is NOT communicable to others through casual contact
Your pregnant relative does not pose a transmission risk to you or others through normal daily interactions. The question appears to be asking whether pregnancy itself, or conditions affecting pregnant women, are contagious—and the answer is definitively no.
Key Points About Infectious Disease in Pregnancy
Pregnancy is not an infectious condition. However, pregnant women can contract certain infections that may have implications for the fetus through vertical (mother-to-child) transmission, not horizontal (person-to-person) transmission to others around them 1.
Infections That Can Affect Pregnant Women
While pregnancy itself is not communicable, pregnant women may be more susceptible to certain infections and can experience more severe disease courses with some pathogens 1:
Respiratory viruses (influenza, SARS-CoV-2): Pregnant women face higher risk of severe illness, ICU admission, and mechanical ventilation compared to non-pregnant women, but they transmit these viruses to others in the same way any infected person would—through respiratory droplets 1, 2, 3
Bloodborne pathogens (HIV, Hepatitis B, Hepatitis C): These require direct blood or body fluid contact for transmission and pose vertical transmission risk to the fetus, not casual contact risk to others 1, 4
Other infections (CMV, toxoplasmosis, parvovirus B19): These are transmitted through specific routes (contact with children's secretions, undercooked meat, respiratory droplets) unrelated to the pregnancy state itself 5, 6, 7
Important Caveats
The pregnancy itself creates no contagion risk. If your relative has a specific infectious disease (like influenza or COVID-19), standard precautions for that particular infection apply—but these are the same precautions you would take with any infected person, pregnant or not 8, 2.
Vertical transmission concerns are separate from horizontal transmission. The medical literature extensively discusses mother-to-fetus transmission of various pathogens 1, 6, 7, but this is entirely distinct from whether the pregnant woman can transmit infections to other adults or children around her through normal contact.
Practical Guidance
You can safely interact with your pregnant relative without special precautions beyond standard hygiene practices. The only scenario requiring additional caution would be if she has a diagnosed infectious disease—in which case, follow the specific isolation recommendations for that pathogen, just as you would for any infected individual 2.