miscarried her baby; This is a spontaneous report from a contactable other HCP. A 33-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), via an unspecified route of administration on 15Jun2021 (Batch/Lot number was not reported) at age of 33-year-old as DOSE NUMBER UNKNOWN, SINGLE for prevention of COVID. Medical history included the patient had exposure to COVID before but she tested negative, this occurred 31Oct2020. She also has history of pneumonia, on 31Dec2020. Obstetrical History: Number of previous pregnancies None that the caller is aware of. The patient's concomitant medications were not reported. The patient became pregnant while taking bnt162b2. The due date was on 25Feb2022. The patient miscarried her baby on 26Jun2021. First Day of Last Menstrual Period was unknown. Caller said the patient thought she was right around 8 weeks when she called her on 16Jun2021 so by the callers calculations it would have been right around 21May2021 (as reported). She confirmed patient did not know but the date was provided by the callers calculation. Risk factors for adverse pregnancy outcomes including environmental or occupational exposures, e.g. hypertension, diabetes, etc. Family history of congenital abnormality/genetic diseases, consanguinity (or any family relation or lineage) between parents (specify degree): None. It was noted in the emergency room note that she had been trying to conceive for 15 years with her spouse, so she was having trouble getting pregnant. Caller was calling from a clinic about the Pfizer COVID vaccine. She has a patient who got the COVID vaccine 15Jun2021 and the patient miscarried her baby on 26Jun2021. She was looking for a place that was taking repots on stuff like that she did not feel that it was really a VAERS report. Dose: She did not have any record of the administration of her having it, she got it in a completely different town. The patient did not smoke during this pregnancy. The patient did not drink alcohol during this pregnancy. The patient did not use illicit drugs during this pregnancy. Caller added the patients blood type was O negative. She saw that Pfizer may be looking at information regarding blood type. Outcome of pregnancy was spontaneous abortion/miscarriage on 26Jun2021. No investigation assessment. The outcome of event was unknown. Seriousness: Caller stated this event was serious.  No follow-up attempts are possible; information about lot/batch number cannot be obtained.; Sender's Comments: Miscarriages/spontaneous abortion occurred 11 days after the vaccination with BNT 162B2.  Given that the patient with her spouse had trouble getting pregnancy for many years, the event more likely is associated with their underlying contributory factors.  More information including genetic, immunological and endocrine workups are needed for fully medical assessment.  The impact of this report on the benefit/risk profile of the Pfizer product is evaluated as part of Pfizer procedures for safety evaluation, including the review and analysis of aggregate data for adverse events. Any safety concern identified as part of this review, as well as any appropriate action in response, will be promptly notified to Regulatory Authorities, Ethics Committees and Investigators, as appropriate.