emergency c-section due to fetal distress; knowingly got the vaccine during the 3rd trimester; This spontaneous prospective pregnancy case was reported by an other health care professional and describes the occurrence of MATERNAL EXPOSURE DURING PREGNANCY (knowingly got the vaccine during the 3rd trimester) and CAESAREAN SECTION (emergency c-section due to fetal distress) in a female patient of an unknown age (gravida 1) who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 026L204) for COVID-19 vaccination.     The patient's past medical history included Infertility female (had infertility treatment), Fainting (hospitalized) in December 2020, Menstrual cycle abnormal (after miscarriage some difficulties with menstrual cycle) and Alcohol use (2-4 times a month prior to pregnancy.) from 25-Mar-2010 to 06-Jun-2020. Previously administered products included for Infertility female: Ovidrel and Letrozole. Family history included Down's syndrome (Cousin). Concurrent medical conditions included Gluten sensitivity, Pregnant and Hypothyroidism since 30-Dec-2019. Concomitant products included LEVOTHYROXINE from 13-Dec-2019 to an unknown date for Hypothyroidism.    On 09-Jan-2021 at 4:00 PM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. The patient's last menstrual period was on 05-Jun-2020 and the estimated date of delivery was 12-Mar-2021. On 09-Jan-2021 at 4:00 PM, the patient experienced MATERNAL EXPOSURE DURING PREGNANCY (knowingly got the vaccine during the 3rd trimester). On 20-Mar-2021, the patient experienced CAESAREAN SECTION (emergency c-section due to fetal distress). The patient received mRNA-1273 (Moderna COVID-19 Vaccine) beginning around the  thirty-first week of the pregnancy. The cesarean delivery occurred on 20-Mar-2021, which was reported as Full-term. For neonate 1, The outcome was reported as Term Birth NOS. Prenatal care was established. Estimated date of conception: 17-Jun-2020. Estimated due date: 12-Mar-2021. There were no perinatal complications for the infant. The patient had an emergency C-section due to fetal distress.  There were no infant abnormalities on delivery or at one month post-partum. On 09-Jan-2021, MATERNAL EXPOSURE DURING PREGNANCY (knowingly got the vaccine during the 3rd trimester) had resolved. At the time of the report, CAESAREAN SECTION (emergency c-section due to fetal distress) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 03-Jul-2020, Pregnancy test: positive (Positive) positive. On 16-Dec-2020, Blood glucose: normal (normal) normal. On 31-Dec-2020, Ultrasound scan: normal (normal) normal.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.   It was reported the patient knowingly received the vaccine in the third trimester. Multiple ultrasounds were all normal.  The patient's estimated date of conception was 17-Jun-2020.  The patient previously had one spontaneous abortion on 17-Dec-2019.   This case was linked to MOD-2021-253190 (Parent-Child Link).   See case MOD-2021-253190 for details regarding the child case.  Most recent FOLLOW-UP information incorporated above includes: On 11-Jul-2021: Relevant history added. Pregnancy details updated with delivery information. Event added.; Sender's Comments: This is a case of product exposure during pregnancy with no associated AEs for this XXyear-old female. Patient will continue to be contacted for further monitoring of AEs during the pregnancy