spotting; This is a spontaneous report from a contactable consumer. This contactable 39-year-old female consumer (patient) reported for herself that.  A 39-years-old female patient received bnt162b2 (COMIRNATY, Solution for injection, Batch/Lot number: unknown), via an unspecified route of administration, administered in Arm Right on Mar2021 (age at vaccine 39-years-old) as DOSE 1, SINGLE for covid-19 immunisation. The patient medical history included none from an unknown date and unknown if ongoing (Patient History: No, states it just hurt when they stuck it in her behind when she was a kid, she can't remember the name). The patient concomitant medications were not reported. It was reported that Prior vaccinations was None. No Prior Vaccinations (within 4 weeks). AE(s) following prior vaccinations was None. Family Medical History Relevant to AE was none. The patient experienced spotting after her first dose on unspecified date in Mar2021. It was reported that Emergency Room visit was No.It was reported that after second dose started to menstruate two days afterward even though had just gotten off of period. Reporter also reports large clots "one was the size of a mouse". Additionally, had 4 periods within a 2 month period after the second dose of Pfizer's COVID 19 vaccine. Reporter stated had an ultrasound of the ovaries and cervix all came back normal. The problems with menstruation was ongoing but improved by being more liquidy with not as many big clots, but still did know when one's going to come. Reporter wants to know how long would expect this to last and when would return back to normal. Reporter stated had very regular period and just gotten off of her period just before the second dose. Period started again 6 days later after period stopped. Reporter states it had improved, it was more liquid, and there was not as many big clots, it was just more liquid now, it was very odd. PCP Reporter stated did not flow over one pad an hour and if would, had contact the doctor. States usually flows a pad an hour and half per pad, reporter monitors it. Suspect Products: First Dose: March 2021 Second Dose: 17Apr202. Indication Continued: reporter states if figured got Covid and was vaccinated, it would not be as bad. VACCINE SUPPLEMENTAL FORM 1. reporter was afraid will get  period out of the blue,  stated the previous agent dismissed her question; would like to talk to another agent. Reporter received  first COVID 19 Pfizer shot,  spotted a little. After the second dose of the Pfizer COVID 19 shot  body started to menstrate and had very large menstrual clots. Reporter had flowed abnormally and ended up had 4 periods in the first two months after the second dose of Pfizer's COVID 19 vaccines. Reporter  would like any information you had and any studies showing what s can expect in the future from this vaccine. The patient experienced spotting on Mar2021 unspecified date. Therapeutic measure were taken as none as a result of event. The patient underwent lab tests and procedures which included diabetes mellitus: unknown results on, investigation: unknown results on, mammogram: unknown, mammogram: normal, thyroid test: normal, diabetes test :normal, full work up panel: unknown result, full work up panel: not anemic, everything was normal,, ultrasound scan vagina: unknown, ultrasound: ovaries and cervix and it was normal on unspecified date. The outcome of the event was recovered on2021.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No follow-up attempts are possible.