suffering from horrible long strong cycles after booster dose; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP), Program ID.  A 41-year-old female patient received BNT162b2 (BNT162B2), as dose 3 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose 1), for Covid-19 Immunization, reaction(s): "after the first 2 doses of the COVID-19 vaccine, her friend had a light change in her menstrual cycle"; Bnt162b2 (Dose 2), for Covid-19 Immunization, reaction(s): "after the first 2 doses of the COVID-19 vaccine, her friend had a light change in her menstrual cycle". The following information was reported: HEAVY MENSTRUAL BLEEDING (non-serious), outcome "not recovered", described as "suffering from horrible long strong cycles after booster dose". The event "suffering from horrible long strong cycles after booster dose" required physician office visit.  Additional information: Other Conditions, other products and investigations reported as unknown. Expiry Date of COVID-19 Vaccine was reported as unknown. It was reported as he has a consumer on line who mentioned she had a lot of friends who were pregnant. She stated the friends took the Pfizer COVID-19 vaccine and got problems after the COVID-19 vaccine. She stated serious issues with menstrual cycles and lost their babies. Reporter stated her friend (patient) was 39 years old when she received the booster dose of COVID-19 Vaccine and is now 40 years old or was 40 years old when she received the booster and is 41 years old now (as reported). She stated after the first 2 doses of the COVID-19 vaccine, her friend had a light change in her menstrual cycle and after her friend's booster dose of the COVID-19 Vaccine almost a year ago, her friend was suffering from horrible long strong cycles and visited physician office multiple times. Reporter stated she doesn't know how long between the booster dose of the COVID-19 vaccine and her next period. Reporter stated she knows this was her first period after the COVID-19 Vaccine. Reporter stated her friend thought if she wants to have more kids she will not be able to. Reporter stated her friend believed the first 2 were preventing COVID but did not and stated that her friend felt coerced to receive the booster so that she would be able to fly. She knows her friend received COVID after the booster dose but she stated her friend might have gotten COVID after the first 2 doses as well. Reporter also stated her friend did not want the booster. It was reported as the reporter was pregnant and wanted to know if the vaccine was safe to take for women and also reported as the reporter was quite afraid. Additional vaccines administered on same date of the Pfizer suspect if applicable, list all vaccines administered on same date with the Pfizer vaccine considered as suspect was reported as No. Prior Vaccinations (within 4 weeks) If applicable, list any other vaccinations within four weeks prior to the first administration date of the suspect vaccine(s) reported as No.   The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.