Table 1.

Sample tweets indicating that COVID-19 vaccination was received during pregnancy or the periconception period.

Tweets		Timestamp	Pregnancy start	Pregnancy end
User 1
	I am bringing a life into this world and that is pretty darn incredible. #16weekspregnant	June 15, 2021	February 23, 2021	November 30, 2021
	Got my first dose of the COVID vaccine today and feeling so excited and grateful for science	March 24, 2021	February 23, 2021	November 30, 2021
User 2
	I’m awake because I’m 13 weeks pregnant and...well...“morning sickness”	June 21, 2021	March 22, 2021	December 27, 2021
	Got my #PfizerVaccine last night!	March 7, 2021	March 22, 2021	December 27, 2021
User 3
	93 days till my due date	April 17, 2021	November 11, 2020	August 18, 2021
	So I just got my second vaccine. So far I feel fine... I’m praying it stays that way all day	March 1, 2021	November 11, 2020	August 18, 2021
User 4
	I’m 8 months pregnant. My family drove down to Tampa with me just in case baby shows up early	June 9, 2021	October 9, 2020	July 16, 2021
	Happy to report I received the Moderna vaccine today	March 6, 2021	October 9, 2020	July 16, 2021