American scientists have proven that vaccination can temporarily increase the duration of the menstrual cycle. This conclusion was made by researchers from the University of Oregon.
A large-scale study confirmed the findings of previous US studies, in which vaccination against COVID-19 was associated with an average increase in the length of the menstrual cycle of just under one day. This increase was not associated with any change in the number of days of menstruation during which bleeding occurs. The new study included almost 20,000 people from around the world who received any of 9 different vaccines. For most of the study participants, the changes disappeared in cycles after vaccination.
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The results provide additional information that may be needed to counsel women about the consequences of vaccination. Possible changes in the length of the menstrual cycle seem small, they are within the normal range. As a reminder, changes in cycle length of less than 8 days are considered normal.
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Although these minor menstrual changes may not matter to medical professionals and researchers , scientists suggest that their presence in bodily functions related to fertility may cause anxiety in those who have encountered them. And this can provoke hesitancy about vaccination, as well as the spread of false information that supporters of the anti-vaccination movement can take advantage of. (READ MORE) 
University of Oregon
Medicine
public research university in the USA located in Eugene, Oregon