The caller got the first vaccine and then ended up getting pregnant in February 2021; heavy excessive vaginal bleeding; Dizziness; nausea; feeling sick; Miscarriage; This is a spontaneous report from a contactable consumer (patient herself). This consumer or other non HCP reported information for both mother and fetus/baby. This is maternal report. A 33-years-old pregnant female patient received first dose of BNT162B2 (COMIRNATY, PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Lot Number: EN6199; Expiration Date: Jun2021) via an unspecified route of administration, administered in Arm Left on 03Mar2021 as single dose for COVID-19 immunization. Patient was pregnant at the time of vaccination. Medical history included hypertension and obesity from an unknown date and unknown if ongoing. The patient's concomitant medications were not reported. History of all previous immunization with the Pfizer vaccine considered as suspect was reported as none. Additional Vaccines Administered on Same Date of the Pfizer Suspect was none. Patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. It was reported that, the caller was calling about the Pfizer COVID 19 vaccine. The caller got the first vaccine and then ended up getting pregnant in February 2021. The caller realized she was pregnant in Feb2021 towards the end of the month, she had some blood work done and it said she was pregnant. On 30Mar2021 the caller went to her OB/GYN to see how the baby was doing and said they couldn't find the heart beat. By March 2021 the caller had to take her second dose and when she did she had a miscarriage right after on 31Mar2021; when they could not find the baby's heartbeat. The caller started feeling sick and went to the emergency room and they didn't know if it was from the miscarriage or not. The caller has been having side effects- extensive bleeding and a lot of blood clots with her period on an unspecified date in Aug2021; for a whole month. The caller called her primary care provider and when she went to the doctor she got a lot of tests done. The tests showed that the caller didn't have a tube pregnancy when she went to the emergency room to make sure it was fine. The patient did an ultrasound and blood tests and it was normal, they just said it was a miscarriage. The caller was so sick with the side effects of the miscarriage. The caller had so much dizziness she couldn't get out of bed and felt like she couldn't walk. Everything was moving, the caller was moving and everything was still and she felt dizzy on 31Mar2021. Patient also experienced nausea on same day 31Mar2021. The caller has had her period longer than 3 weeks. The caller saw online that there were other people with long periods. The heavy excessive vaginal bleeding started this month. After the miscarriage the caller went to he doctor and they checked her tubes and uterus. Everything was fine and nothing was abnormal. When the caller's period was longer than 3-4 weeks, the caller started thinking what was going on now. The caller's friend called her and said she has had a long period too. The caller was concerned because she has had her period almost a month now. At first the caller thought it was a normal long period after the miscarriage. It happened in March and then April and May was whatever. The miscarriage was not as even heavy as this month. The caller's vaginal bleeding starts slowing down and then comes in heavy again. Due to the events miscarriage, heavy excessive vaginal bleeding, nausea, dizziness and feeling sick the  patient required to visit emergency room and physician office. The caller had tests on her heart on 19Apr2021 to make sure everything was okay and it was normal, that's when she saw the cardiologist. The caller went to the hospital a few days later to make sure things were okay, the caller thinks this was on 04Apr2021 or 05Apr2021. The patient underwent lab tests and procedures which included pregnancy test: positive on Feb2021. The outcome of events heavy excessive vaginal bleeding, nausea, dizziness and feeling sick was not recovered while outcome of miscarriage was unknown.  Follow-up attempts are completed. No further information is expected.