passed out at work; abnormal (more than usual) vaginal bleeding; she felt uncomfortable on the morning of 05Apr2021; her hands and feet were cold; she was kind of sweating; she felt sick on 05Apr2021; her body temperature went up; her body felt warm; This is a spontaneous report from a contactable consumer (patient). A 44-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), second dose via an unspecified route of administration, administered in Arm Left on 04Apr2021 15:45 (3:45 PM) (Batch/Lot Number: ER8734) as SINGLE DOSE for covid-19 immunisation. The patient medical history includes Shellfish Allergy (Reported she has had a shellfish allergy for a long time, approximately 7-8 years). She said as long as she had no shellfish, she was completely fine. There were no concomitant medications. There were no prior vaccinations (within 4 weeks). There was no additional vaccine administered on the same date as the COVID-19 Vaccine. The patient previously took bnt162b2 for COVID-19 immunization on 14Mar2021 first dose intramuscular at the left arm (Lot Number: EN6208). It was reported that the patient has received both doses of the Pfizer Covid 19 Vaccine. Her second Pfizer Covid vaccine was received on 04Apr2021. Caller started her menstrual cycle on 07Apr2021. She experienced abnormal vaginal bleeding that night. The following day on 08Apr2021 she passed out at work and was transported to the ER via ambulance. She was advised by the ER provider that her symptom was not related to the Covid 19 vaccine. However, she spoke with her OBGYN and was advised they have heard that abnormal bleeding maybe caused by the Covid 19 vaccine. The patient asked if symptom has been reported? It was further reported that she had her first COVID-19 Vaccine shot on 14Mar2021, and her second COVID-19 Vaccine dose on 04Apr2021 at 3:45 PM (PST). She clarified later in the day on 04Apr2021, the COVID-19 Vaccine kicked in. She said she felt sick on 05Apr2021. She said she felt uncomfortable on the morning of 05Apr2021, but still went to work. She said she felt OK once she got to work, but then took time off from work (on 05Apr2021) because she felt uncomfortable. She said when she got home from work (on 05Apr2021), she took 2 Tylenol. She said she was cold, and her body temperature went up, and she was kind of sweating. She clarified her hands and feet were cold, and later in the day (05Apr2021) her body temperature went up. She said she was aware of the COVID-19 side effects because some of her friends had similar symptoms, so she was kind of expecting the symptoms. She said later in the evening on 05Apr2021, she took 2 Advil and went to bed. She said her body felt warm, but she thought her symptoms were to be expected. She said on 07Apr2021, her (menstrual) period started at 10:00 PM. She said she had abnormal (more than usual) vaginal bleeding for the whole night. She said on 08Apr2021, she felt uncomfortable in the morning when she was getting ready for work. She said she went to work (on 08Apr2021), and at 1:30 PM passed out while at work. She said from her work, she was sent by ambulance to the Emergency Room. She said she was not sure if her passing out had anything to do with the COVID-19 Vaccine, but she had never passed out at work before. She said she asked the Emergency Room doctor about the COVID-19 Vaccine and her passing out. She said the Emergency Room doctor said her passing out had nothing to do with her second COVID-19 Vaccine dose. She said she read more online about the COVID-19 Vaccine. She said she then asked the nurse at her OBGYN's office about abnormal bleeding after getting the COVID-19 Vaccine. She said the nurse had heard of some cases of abnormal bleeding after getting the COVID-19 Vaccine. She said her OBGYN's nurse told her to call to find out if her abnormal bleeding had anything to do with her second COVID-19 Vaccine. She said her OBGYN's nurse provided her with the number to get more information about the COVID-19 Vaccine. It was added that while she was at the Emergency Room, she had 7 vials of blood taken, 2 ultrasounds; an external one of her tummy (abdominal ultrasound), and an internal one where something was stuck in her (transvaginal ultrasound). She said she did not know the results of her testing, and was waiting for a copy of her medical records.  The patient also weighed 165 lbs on an unspecified date. It was reported that for the treatment she had taken 2 Tylenol and 2 Advil at different times while at home, but was at work, and didn't have the Tylenol or Advil to provide the dosing, NDC, Lot, and Expiration Dates. For the Emergency Room treatment she reported an EKG was done, and she was given an IV drip. She said she was not sure what IV fluids were given to her. The patient required visit to Emergency Room and stated she was taken by ambulance on 08Apr2021 and discharged from the Emergency Room at 6:00 PM the same day.  The patient also visited Physician Office and stated she went for a follow-up with her OBGYN doctor at between 9:00 AM-10:00 AM on 09Apr2021. She said the Emergency Room doctor had called her OBGYN doctor on 08Apr2021, while she was in the Emergency Room. The patient underwent laboratory tests which includes: EKG, Blood Test, Abdominal Ultrasound, Transvaginal Ultrasound (All tests were performed while at the Emergency Room on 08Apr2021. Patient stated she was waiting for a copy of her medical records with the test results). The outcome of the events was recovered on Apr2021.