Second dose of Pfizer can be scheduled three weeks (21 days) after your first dose. Booster dose #1 Pfizer can be scheduled 5 months after the completion of your primary series in patients 12 years of age and older. Please reference https://www.cdc.gov/vaccines/covid-19/downloads/summary-interim-clinical-considerations.pdf to see if you are eligible and make sure to read all information on this link.
The summary of recent changes from CDC clinical considerations regarding second Booster:
Summary of recent changes (last updated April 21,2022):
Added guidance that people ages 12 years and older who are moderately or severely immunocompromised may choose to receive a second booster dose using an mRNA COVID-19 vaccine at least 4 months after the first booster dose
Added guidance that adults ages 50 years and older who are not moderately or severely immunocompromised may choose to receive a second booster dose using an mRNA COVID-19 vaccine at least 4 months after the first booster dose. Click on links below to reference.
https://www.cdc.gov/vaccines/covid-19/clinical-considerations/covid-19-vaccines-us.html
https://www.cdc.gov/coronavirus/2019-ncov/vaccines/booster-shot.html#second-booster
https://www.cdc.gov/vaccines/covid-19/downloads/Clinical-Considerations-Second-COVID-19-Booster-508.pdf
*Please consult your doctor or health care provider if you have any questions about vaccine eligibility and current CDC recommendations.*