onset of blood loss and contractions in the lower abdomen, emergency ultrasound, stillbirth with no heartbeat due to placental thrombosis; this is a spontaneous report received from a contactable reporter(s) (consumer or other non hcp) from the medicines agency () -web. regulatory number: it-minisal02-844511 (minisal02). a 27 year-old female patient (pregnant) received bnt162b2 (comirnaty), intramuscular, administered in arm left, administration date 07dec2021 (batch/lot number: unknown) at the age of 27 years as dose 2, single for covid-19 immunisation. relevant medical history included: "pregnancy" (unknown if ongoing). the patient was 6 weeks pregnant at the time of exposure to bnt162b2. the patient was 6 weeks pregnant at the event onset. concomitant medication(s) included: folic acid. vaccination history included: covid-19 vaccine (1st dose, manufacturer unknown), for covid-19 immunisation. the following information was reported: abortion spontaneous (hospitalization, medically significant) with onset 13dec2021, outcome "recovered with sequelae", described as "onset of blood loss and contractions in the lower abdomen, emergency ultrasound, stillbirth with no heartbeat due to placental thrombosis". the pregnancy resulted in spontaneous abortion (13dec2021). the patient underwent the following laboratory tests and procedures: ultrasound scan: results unknown. clinical course: mifepristone used to eliminate dead fetus due to placental thrombosis and subsequent abortion. no follow-up attempts are possible; information about lot/batch number cannot be obtained. no further information is expected.; reporter's comments: nothing; sender's comments: linked report(s) : it-pfizer inc-202200320250 mother/ foetus cases