Whooping cough, or pertussis, is an infection that causes severe coughing and sometimes difficulty breathing. It can affect anyone, but the infection is most serious in newborn babies, and can even cause death. Unfortunately, the CDC reports that about 30% of babies in the U.S. <1 year-old who get whooping cough are hospitalized and 1 in 100 who need treatment in the hospital die. Newborns whose mothers did not receive the Tdap vaccine in pregnancy are at greater risk of severe illness.

Source:
CDC - Whooping Cough (Pertussis)

The Tdap (whooping cough) vaccine is recommended during the third trimester of pregnancy because it helps protect your newborn from whooping cough (pertussis). Babies are not able to get the whooping cough vaccine until they are two months old, so they are vulnerable to whooping cough infection in the first few months of life. When a pregnant individual is vaccinated for whooping cough during pregnancy, their body produces germ fighting cells that cross the placenta and can help protect their newborn baby until they can be vaccinated.

Source: 
CDC - Whooping Cough Vaccine and Pregnancy

Tdap stands for tetanus, diphtheria, and acellular pertussis. The Tdap vaccine helps protect you and your baby from three diseases: diphtheria, tetanus and pertussis. You may have also heard of the Tdap vaccine referred to as the “whooping cough” vaccine. “Whopping cough” is another name for pertussis.

Source: 
CDC - Whooping Cough Vaccine

The most reputable society of doctors caring for pregnant women, the American College of Obstetrics and Gynecology, recommends that pregnant individuals get the Tdap/whooping cough vaccine between 27 and 36-weeks of pregnancy. Vaccinating during this time allows the pregnant person’s body to make cells that detect and fight off germs and transfer those cells to the baby.  Pregnant individuals should receive the Tdap vaccine during every pregnancy.

Source:
ACOG - Update on Immunization and Pregnancy: Tdap

Yes! Studies have shown that there is no increased risk to you or your baby after receiving the Tdap vaccine during pregnancy.

Source: 
CDC - Whooping Cough Vaccines are Safe

Most adults will have received the Tdap vaccine at some point during adolescence. If an adult in close contact with your baby has never received a Tdap vaccine, the American College of Obstetricians and Gynecologists recommends the adult receive a Tdap vaccine 2 weeks before visiting your baby.
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Source:
https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2017/09/update-on-immunization-and-pregnancy-tetanus-diphtheria-and-pertussis-vaccination

Most clinics carry the Tdap vaccine and you can receive the vaccine at one of your routine visits. If your provider does not carry the Tdap vaccine, most local pharmacies can provide the vaccine.

Source: 
Washington State Department of Health - Whooping Cough