evidence: COVID-19 Vaccines Don’t Cause Infertility or Harm Pregnancy Chances, BU Research Shows [...] "Our study shows, for the first time, that COVID-19 vaccination in either partner is unrelated to fertility among couples trying to conceive through intercourse," says Wesselink. "Time-to-pregnancy was very similar regardless of vaccination status." [...] "These findings provide reassuring evidence that COVID vaccination in either partner does not affect fertility among couples trying to conceive," says Lauren Wise, an SPH professor of epidemiology and a senior author on the study. She says the study’s results are robust, because PRESTO "enrolls participants before pregnancy, collects data on vaccination and other variables during the preconception period, and then collects data on subsequent fertility after enrollment"—what scientists call a prospective study. A large study size and geographic diversity were also strengths, says Wise, "as was our control for many variables, such as age, socioeconomic status, preexisting health conditions, occupation, and stress levels."