I’m pretty sure the vaccine becomes effective 2 weeks after you take your first dose, not your second. The second dose is just supposed to make sure the vaccine is 100% effective.

https://www.chron.com/news/article/How-quickly-do-I-need-a-second-COVID-19-vaccine-15852144.php

I’m pretty sure the vaccine becomes effective right after you take your first dose. The second dose is just supposed to make the vaccine 100% effective.

https://www.chron.com/news/article/How-quickly-do-I-need-a-second-COVID-19-vaccine-15852144.php