I started having spotting and slowly bleeding and cramping every day which lead to miscarriage; started having spotting and slowly bleeding and cramping every day which lead to miscarriage; My PCP told I was 9weeks pregnant according to my last menstural period so she told me to get Pfizer vaccine so I got it; started having spotting and slowly bleeding and cramping every day which lead to miscarriage; started having spotting and slowly bleeding and cramping every day which lead to miscarriage; chills; fever; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 27-year-old female patient (pregnant) received BNT162b2 (BNT162B2), on 10May2022 as dose 3 (booster), single (Lot number: FJ6369) at the age of 27 years, in left arm for covid-19 immunisation. The patient's relevant medical history was not reported. Date of last menstrual period: 04Mar2022. The patient was 9 weeks pregnant at the time of exposure to BNT162b2. The patient was 10 weeks pregnant at the event onset. The patient is expected to deliver a baby(s) on 09Dec2022. There were no concomitant medications. Vaccination history included: Covid-19 vaccine (Primary Immunization series complete but unknown manufacturer, Lot number: FJ6369, Administration date and time: 10May2022 04:45 PM, Dose number: 1, location: Left arm), for COVID-19 immunization. The following information was reported: CHILLS (non-serious) with onset 12May2022, outcome "unknown"; PYREXIA (non-serious) with onset 12May2022, outcome "unknown", described as "fever"; ABORTION SPONTANEOUS (medically significant), outcome "unknown", described as "I started having spotting and slowly bleeding and cramping every day which lead to miscarriage"; HAEMORRHAGE (medically significant), INTERMENSTRUAL BLEEDING (non-serious), DYSMENORRHOEA (non-serious), outcome "unknown" and all described as "started having spotting and slowly bleeding and cramping every day which lead to miscarriage"; MATERNAL EXPOSURE DURING PREGNANCY (non-serious), outcome "unknown", described as "My PCP told I was 9weeks pregnant according to my last menstural period so she told me to get Pfizer vaccine so I got it". The events "i started having spotting and slowly bleeding and cramping every day which lead to miscarriage", "started having spotting and slowly bleeding and cramping every day which lead to miscarriage", "my pcp told i was 9weeks pregnant according to my last menstural period so she told me to get pfizer vaccine so i got it", "chills" and "fever" required emergency room visit. Therapeutic measures were taken as a result of abortion spontaneous, maternal exposure during pregnancy, chills, pyrexia. Clinical Course: patients Last menstrual date was on 04Mar2022. patient had Gestational period: 9. Patient received other Pfizer vaccine same date product with lot# FJ6369, Facility type vaccine at Hospital. patient did not had other vaccine in four weeks and other medications in two weeks patient reported On 11May My PCP told she was 9weeks pregnant according to her last mensural period so she told her to get Pfizer vaccine so she got it and 12May she had chills fever and had to call out. she was healthy fit and fine before vaccine. she started having spotting and slowly bleeding and cramping every day which lead to miscarriage. Adverse Event start date: 11May2022. Adverse event start time: 11:45 PM. Patient did not had COVID prior vaccination and not COVID tested post vaccination. Patient did not had known allergies and other medical history.  No follow-up attempts are needed. No further information is expected.