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A woman receives a COVID-19 vaccine injection by a pharmacist at a clinic in Lawrence, Mass., on Wednesday, Dec. 29, 2021, Research published Wednesday, Jan. 6, 2022, tracked nearly 4,000 U.S. women through six menstrual cycles and on average, the next period after a shot started about a day later than usual. But there was no change in the number of days of menstrual bleeding after COVID-19 vaccination. (AP Photo/Charles Krupa, File) **FILE**

A woman receives a COVID-19 vaccine injection by a pharmacist at a clinic in Lawrence, Mass., on Wednesday, Dec. 29, 2021, Research published Wednesday, Jan. 6, 2022, tracked nearly 4,000 U.S. women through six menstrual cycles and on average, the next period after a shot started about a day later than usual. But there was no change in the number of days of menstrual bleeding after COVID-19 vaccination. (AP Photo/Charles Krupa, File) **FILE**

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