Anxiety
Snowball sampling
Pregnancy
Medicine
Prenatal care
Perceived Stress Scale
Mental health
Pandemic
Clinical psychology
Observational study
Cross-sectional study
Health care
Coronavirus disease 2019 (COVID-19)
Psychology
Psychiatry
Stress (linguistics)
Environmental health
Disease
Population
Linguistics
Philosophy
Genetics
Pathology
Infectious disease (medical specialty)
Economics
Biology
Economic growth
