“These silent ovulatory disturbances likely explain why so many women who are not taking hormonal forms of birth control reported having early or unexpected periods in the days following a Covid-19 vaccination,” said Jerilynn C. Prior, M.D., FRCPC, Professor of Endocrinology at the University of British Columbia in Vancouver, Canada.

Nearly two in three women who took part in the research during Covid-19 were not ovulating normally, Ms. Prior said.

The women either experienced short luteal phases, in which an egg was released without enough time from ovulation for pregnancy to occur, or anovulation, meaning no egg was released at all.

Menstrual Cycle Diary analyses for Menstruation ovulation Study (MOS2) showed significantly increased anxiety, depression, frustration, (overall negative moods), perceived outside stresses, sleep problems, and headaches compared to MOS.

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