There has been no report of the vaccine causing infertility in men or women. False information that the spike protein on the corona virus was the same as the syncitin 1 protein which helps the development of the placenta during pregnancy. Fear arose that the vaccine would then interfere with placenta attachment and growth. This is not true as the proteins are completely different. During the Pfizer vaccine tests, 23 women volunteers involved in the study became pregnant, and the only one who suffered a pregnancy loss had not received the actual vaccine, but a placebo.


Reference: https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-19-vaccines-myth-versus-fact