ZDU-26829-75352 · OpenVSafe

Timeline

Registration Vaccinations Survey responses Call reports Cases without a report Call attempts Call successful Pregnancy survey

2021-03-23
Dose 1 — Pfizer-BioNTech
2021-03-26
Registered in v-safe
2021-03-27
Health check-in — days 1–6 daily, dose 1
Feeling: Good · None

Adult check-in
2021-04-20
Dose 2 — Pfizer-BioNTech
2021-04-22
Survey response — days 1–6 daily, dose 2
MedDRA: Fatigue, Heavy menstrual bleeding — Feeling: Fair · Fatigue or tiredness

Free text: I would like to add that one week after my first dose of vaccine I began to have a much heavier than usual period, which lasted twice as long as normal. I didnt at the time make note of it because I attributed it to age-related irregularities and attributed the fatigue I was feeling with my unusually heavy period rather than with the first dose of the Pfizer Vaccine. In hindsight I do think it is possible that the vaccine affected my cycle and should be noted as a possible side effect.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-06
Health check-in — day 14, dose 2
Feeling: Good

Adult check-in
2021-07-20
Survey response — 3 months, dose 2
MedDRA: Abnormal menstrual clots, Heavy menstrual bleeding — Feeling: Fair · Be unable to do your normal daily activities

Free text: I am currently experiencing my second extremely heavy menstrual bleeding since the vaccine. I am into my second week of heavy bleeding with large clots. I am 47 years old and have grown accustomed to short, light periods until the vaccine.

MedDRA releases: 2024-11 · check-in free text available

Vaccinations

Dose	Date	Manufacturer	Co-administered
1	2021-03-23	Pfizer-BioNTech
2	2021-04-20	Pfizer-BioNTech

Free text

Release 7 — days 1–6 daily, dose 2

2021-04-22

Systemic reaction (other): I would like to add that one week after my first dose of vaccine I began to have a much heavier than usual period, which lasted twice as long as normal. I didnt at the time make note of it because I attributed it to age-related irregularities and attributed the fatigue I was feeling with my unusually heavy period rather than with the first dose of the Pfizer Vaccine. In hindsight I do think it is possible that the vaccine affected my cycle and should be noted as a possible side effect.

Release 9 — 3 months, dose 2

2021-07-20

Symptoms: I am currently experiencing my second extremely heavy menstrual bleeding since the vaccine. I am into my second week of heavy bleeding with large clots. I am 47 years old and have grown accustomed to short, light periods until the vaccine.

Each entry is dated by the survey it was written in (the CDC re-sent the releases with survey dates in 2025); click a date to see that survey response. The CDC cut some text off at about 250 characters: symptoms in every release, and the other two fields in releases 9-12. Those entries are marked "cut off by CDC".

MedDRA terms by release

Field	Preferred term	2021-09	2023-04	2024-11
SD	Abnormal menstrual clots	·	·	✓
SD	Heavy menstrual bleeding	·	·	✓
SRO	Fatigue	✓	✓	✓
SRO	Heavy menstrual bleeding	✓	✓	✓

✓ active code · ○ coded but marked inactive · blank = not in that release