YCK-16081-33179 · OpenVSafe

Timeline

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

2021-03-18
Dose 1 — Pfizer-BioNTech
2021-04-08
Dose 2 — Pfizer-BioNTech
2021-04-12
Registered in v-safe
2021-04-12
Health check-in — days 1–6 daily, dose 2
Feeling: Good · Site: Pain · None

Adult check-in
2021-04-13
Health check-in — days 1–6 daily, dose 2
Feeling: Good · None

Adult check-in
2021-04-14
Health check-in — days 1–6 daily, dose 2
Feeling: Good · None

Adult check-in
2021-04-15
Health check-in — day 7, dose 2
Feeling: Good · None

Adult check-in
2021-04-22
Survey response — day 14, dose 2
MedDRA: Abdominal distension, Dysmenorrhoea, Menstruation normal — Feeling: Fair

Free text: Started menstruation cycle for first time since 2017. I have Mirena IUD and have had no period for years. Also related menstrual cramps, bloating.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-04-29
Survey response — day 21, dose 2
MedDRA: Unevaluable event — Feeling: Fair

Free text: Still continuing to have menstrual spotting, however tapering.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-06
Health check-in — day 28, dose 2
Feeling: Good

Adult check-in
2021-05-13
Health check-in — day 35, dose 2
Feeling: Good

Adult check-in
2021-05-20
Health check-in — day 42, dose 2
Feeling: Good

Adult check-in
2021-07-08
Survey response — 3 months, dose 2
MedDRA: Complication associated with device, Heavy menstrual bleeding, Menstrual disorder — Feeling: Good

Free text: My period returned again for the second time post vaccination. I had no periods for 5 years due to the insertion of IUD (Mirena). I had my first strong period following the second dose of Pfizer. This second period was less heavy, many symptoms.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-10-07
Health check-in — 6 months, dose 2
Feeling: Good

Adult check-in

Vaccinations

Dose	Date	Manufacturer	Co-administered
1	2021-03-18	Pfizer-BioNTech
2	2021-04-08	Pfizer-BioNTech

Free text

Release 7 — day 14, dose 2

2021-04-22

Symptoms: Started menstruation cycle for first time since 2017. I have Mirena IUD and have had no period for years. Also related menstrual cramps, bloating.

Release 8 — day 21, dose 2

2021-04-29

Symptoms: Still continuing to have menstrual spotting, however tapering.

Release 9 — 3 months, dose 2

2021-07-08

Symptoms: My period returned again for the second time post vaccination. I had no periods for 5 years due to the insertion of IUD (Mirena). I had my first strong period following the second dose of Pfizer. This second period was less heavy, many symptoms.

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	Abdominal distension	✓	✓	✓
SD	Complication associated with device	✓	✓	○
SD	Dysmenorrhoea	✓	✓	✓
SD	Heavy menstrual bleeding	·	·	✓
SD	Menstrual disorder	✓	✓	✓
SD	Menstruation normal	✓	✓	✓
SD	Unevaluable event	✓	✓	✓

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