This study is looking at how safe it is to give pregnant people both the mRNA COVID-19 vaccine and the flu vaccine. Some participants will get both vaccines on the same day, while others will get them 7-14 days apart. Participants will be monitored for any side effects like soreness or fever for 6 days after each shot. Doctors will keep track of any serious health problems during the study. Blood samples from the mother will be taken before the vaccines and after, to see how well the body makes antibodies, which are proteins that help fight infections. The study lasts through pregnancy and 90 days after delivery to check on the health of the mother and baby.

• Participants must visit the study site for two vaccine appointments and follow-ups.
• Participation is open to pregnant people 18 years or older, who can speak English, Spanish, or Haitian Creole.
• Participants should be willing to provide information and blood samples.

Before joining, make sure you are not planning to enroll in another vaccine study and that you haven't had certain health issues like severe allergies to vaccines or recent infections.