Little tired; Dose 1- 08Feb2021 and Dose 2- 25Feb2021; This is a spontaneous report from a contactable other health professional (patient). A 73-years-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Batch/Lot number: EN6202), via intramuscular route of administration in deltoid right on 25Feb2021 as dose 2, single for covid-19 immunization (at the age of 73-years-old). Medical history included diagnosed allergies, compromised immune status, respiratory illness, genetic/chromosomal abnormalities, endocrine abnormalities (including diabetes) and obesity, Type 2 diabetes Onset Date: 1998 Stop Date: continuing. The patient concomitant medications were not reported. Historical vaccine included first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Batch/Lot number: EL9269), via intramuscular route of administration in deltoid right on 08Feb2021 as dose 1, single for covid-19 immunization (at the age of 73-years-old). The patient did not receive any other vaccines within 4 weeks prior to the COVID-19 vaccine. The patient received the second dose after 17 days from first dose. On 06Feb2021, the patient was little tired. The reporter stated that "Her doctor said the doses were 17 days apart and were supposed to be 21 days apart. "I don't know if my vaccines are legal or legitimate. My husband did the same thing. I don't know if we need another dose. We had no symptoms, never had any symptoms. patient reported that, She and her husband both received second dose of the Pfizer Biontech COVID 19 vaccine 17 days after receiving the first. Her doctor made her aware that they were 17 days apart and they should have been 21 days. She had concerns about if they needed to get second dose again or if it was ok. She answered her question with regards to dosing. Her doctor referred her to VAERS and VAERS referred her to Pfizer. She is transferring her because it was outside of the 19-42 days window. Neither one had any symptoms or issues. Separate report completed for her husband. There was no prescriber. Their doctor just wanted a record of their vaccination. Their nurse noticed it was not 21 days apart. They told her where they got the vaccination they told that it only had to be 14 days apart. There are lots of people in the same situation. She had no further details on any others to report. Her big concern is if someone would question if she went into another country next year and if they were legal. She thinks it was completed. They felt great. She was just a little tired the day after getting the second dose (26Feb2021). The adverse events did not result in emergency or physician room visit. They had no other symptoms. There were no relevant tests done. The outcome of the events were unknown.  Information on the lot/batch number has been requested.  Follow-up (25May2021): This is a follow up spontaneous report from a contactable nurse. This 73-year-old female nurse (patient) reported that included: updated other relevant history, route of administration, anatomical location, lot number, adverse event, age, age at vaccination, historical dose details and clinical course.  Additional information has been requested.; Sender's Comments: Linked Report(s) : US-PFIZER INC-2021602155 Same reporter/ drug/ event for different patients.