Very extended menstrual cycle; This is a spontaneous report from a contactable consumer or other non-health care professional. A 48-years-old female patient received second dose of bnt162b2 (BNT162B2, formulation: solution for injection, Batch/Lot Number: EW0169) via an unspecified route of administration and administered in left arm on 08May2021 08:00  (at the age of 48-years-old) as 2nd dose, single dose for COVID-19 immunization. Medical history included ongoing High blood pressure for about 2 years, maybe not even that long, iron deficiency and It was probably like from 2015. Her daughter had Covid. The patient's concomitant medications were not reported. She finished her infusions and was at a good level. She finished those before she had the first vaccine. She doesn't know if that would be relevant and she doesn't think she takes anything relevant, just a blood pressure medicine. No other medications taken within 4 weeks, Prior to Vaccinations. No AE was reported following prior vaccinations. No Family Medical History Relevant to AE. Historical vaccine includes first dose of bnt162b2 (BNT162B2, solution for injection, Batch/Lot Number: ER8731) via an unspecified route of administration and administered in left arm on 17Apr2021 as 1st dose, single dose for COVID-19 immunization. She does not know a dosage for either dose. Patient took Covid Shot, wanted to be protected against the virus. Investigation Assessment was provided. The patient experienced very extended menstrual cycle on 12May2021 since she had the second Covid shot. It has not gotten better. Her daughter got the Covid vaccine the same day, and she just started her period. The caller was interested to see if she would have an extended period too. She was 16 years old. She was talking to 2 girls in her office who also just had the second Pfizer Covid vaccine and are having extended menstrual bleeding. They are not having it to the extent she was, they are just having spotting. Patient was 48 years old, and since she has been a teen about 7 days, she was normally like clockwork. Today was day 14 of her menstrual cycle, after second. Since the beginning of her period, she has been doubling overnight pads and they are saturated. Within 48 hours she went through 2 bags of pads. She went to ER on Tuesday night because she was bleeding so bad. Right now, she was on her way to the OBGYN now because they said she needed to follow up. They gave her Progesterone to slow the bleeding, but it was not a long-term fix. She does not have an NDC, lot, or expiration date for the Progesterone available. She went to the ER and had the tests on Tuesday. Patient was not hospitalized due to event caused. Lab tests included she had bloodwork done, but it was not related to this. When she went to the hospital, they did prick on her finger to test her haemoglobin levels which were okay. They did a pelvis ultrasound to make sure she had no fibroid or other issues, and she didn't have. Outcome of the event was not recovered.  PC filed.  Description of complaint: While reporting an AE on the COVID Vaccine, patient mentioned that her OBGYN gave her Progesterone to slow the bleeding during an extended menstrual cycle, but she was still experiencing heavy bleeding. She does not have an NDC, lot, or expiration date for the Progesterone available. No Product strength and count size  was dispensed. No Additional lot numbers. PC identified after the call. Additional details unable to be obtained.