Be mindful that refugee & asylum-seeker women have higher levels of mental health problems, not only because they are more likely to have experienced traumatic life events (ie. peace conflicts, poverty, etc.), but also because they often lose their social support networks in the migration process. Social support is a major protective factor against mental health issues for all people.
Also consider that many diagnostic measures for mental health do not assess valid differences in risk across different cultural groups & conduct a thorough screening by asking questions about food security, housing, discrimination, language proficiency, environmental navigation, legal status (if precarious status is causing them anxiety) and other factors that make the migrant pregnancy experience unique.