Complications from heart surgery; consumer reports receiving a first injection of the Moderna covid-19 vaccine on 31Mar2021./she was administered her first injection of the Pfizer covid-19 injection about a week ago; This is a spontaneous report from a contactable consumer (patient) via Medical Information Team. A 38-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection), via an unspecified route of administration in arm on an unspecified date/between noon at 14:00 (at the age of 38 years) as a dose 1, single for COVID-19 immunisation. Co-suspect medication included MRNA 1273 (MODERNA COVID-19 VACCINE, Formulation: Solution for injection), via an unspecified route of administration on 31Mar2021 as a dose 1, single for COVID-19 immunisation. The family medical history relevant to adverse event was reported as none. The patient's medical history (including any illness at time of vaccination) included congenital heart defect, since birth and surgery, the patient had surgery last year and was having complications from that. The patient did not had concomitant medications. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available) was reported as this was her first dose. Additional vaccines administered on same date of the Pfizer suspect was reported as she had a shot that she now had to give herself that was similar to Warfarin. It was reported that, the patient needed help in finding out how to schedule her second injection of the Pfizer covid-19 vaccine. This female consumer worked as an in home caregiver for a while but not recently, reported receiving a first injection of the Moderna covid-19 vaccine on 31Mar2021. After that, she was hospitalized twice and unable to receive her second injection of the Moderna covid-19 vaccine. Stated that, she didn't have any symptoms from the vaccine, she has a congenital heart defect. She had surgery last year and was having complications from that. It was hard to tell her weight because of water retention. This morning it was 183.3. She declines to provide physician information. The complications from heart surgery, she doesn't remember exactly when that started or what days she was in the hospital. It was a week or a week and a half ago. She finally started getting better. The patient received Pfizer Covid Vaccine after receiving Moderna Covid Vaccine. Stated that, she doesn't remember exactly what day she got it. It was a week or a week and a half ago while she was in the hospital. She doesn't know which arm she had it in, there were lots of needle. She has paperwork, but she would have to read through to fine the lot number. She does not have an NDC, lot or expiration date. She got the Moderna Covid Vaccine on 31Mar2021 in her right arm. After when she was scheduled for the second dose she was in the hospital both times and could not do it. The last time she was in the hospital it had been too long for it to be considered the second dose of the Moderna, so they gave her the Pfizer. She called to find out when exactly to get the second Pfizer. She was recently released from the hospital and she was unable to get the second injection of the Moderna covid-19 vaccine from her physician, but the physician had the Pfizer covid-19 vaccine and she was administered her first injection of the Pfizer covid-19 injection about a week ago. Stated that, her hospitalizations were not related to the Moderna covid-19 vaccine. The consumer stated that, she was supposed to get a second injection of the Pfizer covid-19 vaccine when it was due. Response included referred to her vaccination provider/physician. Explained that, Pfizer was not involved in scheduling and also explained from PI Pfizer has no data on interchangeability with other covid-19 vaccines. The reporter seriousness and dates for the events was unspecified. The AE(s) following prior vaccinations was reported as probably really good at forget. Stated that, she had everything and on an unspecified date, the patient underwent lab tests and procedures which included blood tests, cerebro-spinal fluid culture, pleural fluid culture, urine culture, Chest X-ray, MRI, all resulted as unknown results and water retention, resulted as 183.3 this morning on an unspecified date. The outcome of the events was recovering.  Follow up information has been requested.