Z3V-25971-36269 · OpenVSafe

Timeline

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

2021-03-30
Dose 1 — Pfizer-BioNTech
2021-04-20
Dose 2 — Pfizer-BioNTech
2021-04-27
Registered in v-safe
2021-04-27
Survey response — day 7, dose 2
MedDRA: Menstruation delayed — Feeling: Good

Free text: My period is now 7 days late. I have a hormonal IUD. This is highly unusual for me. Usually 28 day cycle. I got both shots during one cycle.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-04
Survey response — day 14, dose 2
MedDRA: Menstrual disorder, Menstruation delayed — Feeling: Good

Free text: Still havent begun a menstrual cycle. Currently about 14 days late. I have an IUD and am usually very regular. Havent taken a pregnancy test yet, but i think that is highly unlikely, having had sex once in 4 months and an IUD and Im 42.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-11
Survey response — day 21, dose 2
MedDRA: Menstruation delayed — Feeling: Good

Free text: Still no period since my first vaccine on 3/30. I did take a pregnancy test, which was negative.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-18
Survey response — day 28, dose 2
MedDRA: Menstruation irregular — Feeling: Good

Free text: I got my period for the first time since my first vaccination on 3/30/21. It is right on time as if I hadnt skipped last month. This is highly unusual for me (iud and have always been very regular). All good now! JustWant to make sure you are awar

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-25
Health check-in — day 35, dose 2
Feeling: Good

Adult check-in
2021-06-01
Health check-in — day 42, dose 2
Feeling: Good

Adult check-in
2021-07-20
Health check-in — 3 months, dose 2
Feeling: Good

Adult check-in
2021-10-19
Health check-in — 6 months, dose 2
Feeling: Good

Adult check-in
2022-04-20
Health check-in — 12 months, dose 2
Feeling: Good

Adult check-in

Vaccinations

Dose	Date	Manufacturer	Co-administered
1	2021-03-30	Pfizer-BioNTech
2	2021-04-20	Pfizer-BioNTech

Free text

Release 8 — day 7, dose 2

2021-04-27

Systemic reaction (other): My period is now 7 days late. I have a hormonal IUD. This is highly unusual for me. Usually 28 day cycle. I got both shots during one cycle.

Release 8 — day 14, dose 2

2021-05-04

Symptoms: Still havent begun a menstrual cycle. Currently about 14 days late. I have an IUD and am usually very regular. Havent taken a pregnancy test yet, but i think that is highly unlikely, having had sex once in 4 months and an IUD and Im 42.

Release 8 — day 21, dose 2

2021-05-11

Symptoms: Still no period since my first vaccine on 3/30. I did take a pregnancy test, which was negative.

Release 8 — day 28, dose 2

2021-05-18

Symptoms: I got my period for the first time since my first vaccination on 3/30/21. It is right on time as if I hadnt skipped last month. This is highly unusual for me (iud and have always been very regular). All good now! JustWant to make sure you are awar

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	Menstrual disorder	✓	✓	✓
SD	Menstruation delayed	✓	✓	✓
SD	Menstruation irregular	✓	✓	✓
SRO	Menstruation delayed	✓	✓	✓

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