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Timeline

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

2021-02-22
Dose 1 — Pfizer-BioNTech
2021-03-15
Dose 2 — Pfizer-BioNTech
2021-03-18
Registered in v-safe
2021-03-19
Survey response — days 1–6 daily, dose 2
MedDRA: Menstrual disorder — Feeling: Fair · Site: Pain · Joint pains, Muscle or body aches, Fatigue or tiredness · Be unable to work, Be unable to do your normal daily activities, Get care from a doctor or other healthcare professional · Outpatient clinic or urgent care clinic visit

Free text: I got my period For the first time in a year and a half, 2 days after getting The vaccine

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-03-19
Report sent to call center — days 1–6 daily, dose 2
Be unable to work · Be unable to do your normal daily activities · Get care from a doctor or other healthcare professional

1 call case(s)
2021-03-20
Survey response — days 1–6 daily, dose 2
MedDRA: Dysmenorrhoea — Feeling: Good · Site: Pain

Free text: I still have my period that started a couple days after the vaccine (the cramps started the day of). Not sure if getting the dose in the same arm as my birth control insert had any affect on that.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-03-29
Health check-in — day 14, dose 2
Feeling: Good

Adult check-in
2021-04-06
Survey response — day 21, dose 2
MedDRA: Polymenorrhoea — Feeling: Fair

Free text: I got my period for the second time in 3 weeks.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-04-19
Health check-in — day 35, dose 2
Feeling: Good

Adult check-in
2021-04-26
Survey response — day 42, dose 2
MedDRA: Menstruation irregular — Feeling: Fair

Free text: I think the vaccine messed with my birth control implant. My periods have been very often and unregular since I got vaccinated

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-06-14
Health check-in — 3 months, dose 2
Feeling: Fair

Adult check-in
2021-09-13
Health check-in — 6 months, dose 2
Feeling: Good

Adult check-in
2022-03-04
Call successful
Participant prefers to complete VAERS report online

Vaccinations

Dose	Date	Manufacturer	Co-administered
1	2021-02-22	Pfizer-BioNTech
2	2021-03-15	Pfizer-BioNTech

Call center

1 call center case

1 successful

See the call center timeline

Free text

Release 6 — days 1–6 daily, dose 2

2021-03-19

Systemic reaction (other): I got my period For the first time in a year and a half, 2 days after getting The vaccine

2021-03-20

Systemic reaction (other): I still have my period that started a couple days after the vaccine (the cramps started the day of). Not sure if getting the dose in the same arm as my birth control insert had any affect on that.

Release 7 — day 21, dose 2

2021-04-06

Symptoms: I got my period for the second time in 3 weeks.

Release 8 — day 42, dose 2

2021-04-26

Symptoms: I think the vaccine messed with my birth control implant. My periods have been very often and unregular since I got vaccinated

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	Menstruation irregular	✓	✓	✓
SD	Polymenorrhoea	✓	✓	✓
SRO	Dysmenorrhoea	✓	✓	✓
SRO	Menstrual disorder	✓	✓	✓

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