In short, no! The menstrual cycle is itself a cycle of immunity. The immune system is suppressed during ovulation to allow sperm to enter. It then kicks in again in order to shed the lining of the uterus.
While some women have noted a change in their menstrual cycle after vaccination, these changes can be explained by a number of different factors including stress, illness, or lifestyle changes. The COVID-19 vaccination has not been found to have any direct link to changes in menstrual cycles, and doctors and scientists do not see any physiological reason for this to occur, and the evidence around abnormal periods is so far purely anecdotal [4,5].
Ultimately, menstrual health can be a reflection of one’s overall health, and periods, including length and flow of a menstrual cycle, vary widely from person to person. Vaccines are safe, effective and necessary to end the pandemic.