We were talking about off-label use by physicians and you said “Name one.”Not true. One study was published in JAMA in October of 2015.
https://www.webmd.com/baby/news/20151020/study-says-tdap-vaccine-safe-during-pregnancy#1
"The vaccination can be given at any time during pregnancy as it is not a live vaccine," said Dr. Tracy Adams, a maternal-fetal medicine specialist at Winthrop-University Hospital in Mineola, N.Y. "This study adds to the growing body of evidence that suggests the safe use of inactivated virus or bacterial vaccines or toxoids in pregnancy in order to prevent disease in both mother and child."
Meanwhile, the Tdap vaccine protects against whooping cough, which has increased in prevalence over the past decade in the United States, the researchers pointed out. And newborns and infants are more likely to be hospitalized or die from whooping cough than older children and adults.
In the study, the researchers analyzed data from more than 29,000 women who received Tdap in pregnancy in California, Colorado, Minnesota, Oregon, Washington and Wisconsin. They compared outcomes among those women who had received a tetanus-containing vaccine less than two years before pregnancy, two to five years before pregnancy and more than five years before pregnancy.
Regardless of how long it had been since the women last received a tetanus-containing vaccine, there were no significant differences in rates of fever, allergy or local reactions among mothers or in rates of small for gestational age, premature birth and low birth weight among infants.
Then you provided a study showing it was used off-label 29,000 times.