Comparing the Incidence of Preeclampsia Between Pregnant Women Receiving Tdap Vaccinations at Week 28 or at Week 36

Tdap vaccinations are routinely given during pregnancy between weeks 27 and 36 per guidelines of American College Obstetrics and Gynecology (ACOG) -- but this study uniquely is trying to establish that the earlier Tdap vaccinations reduce preeclampsia by more than 50%