UVB phototherapy is considered safe whilst pregnant, so in the normal case yes but always check with your doctor.

Patients with SAD typically report an alleviation of depressive symptoms within two to 14 days after beginning phototherapy.

phototherapy,exchange transfusion

Phototherapy is very effective in reducing bilirubin levels in the majority of infants who need it. There are usually no long-term effects on the child from the hyperbilirubinemia or the phototherapy

Phototherapy is prescribed primarily to treat seasonal affective disorder (SAD), a mood disorder characterized by depression in the winter months, and is occasionally employed to treat insomnia and jet lag.