womens health

Exploring the Link Between COVID Vaccination and Miscarriage Risk: What We Know So Far

As the world continues to battle against the COVID-19 pandemic, vaccination has been one of the most effective weapons in our arsenal. However, concerns have arisen about whether getting vaccinated might increase the risk of miscarriage among pregnant women. In this article, we will explore what we know so far about this topic.

What is a Miscarriage?

A miscarriage is defined as losing a pregnancy before 20 weeks gestation. It can be caused by many factors such as chromosomal abnormalities, hormonal imbalances, infections or underlying medical conditions like diabetes or thyroid disease.

COVID Vaccines and Pregnancy

When it comes to pregnancy and vaccinations there are still some unknowns but recent studies suggest that vaccines do not pose any significant risks for pregnant people or their babies. The Centers for Disease Control and Prevention (CDC) recommends that all eligible individuals should get vaccinated against COVID-19 including those who are pregnant or breastfeeding since they may be at higher risk of severe illness from COVID-19.

Research on Miscarriages after COVID Vaccination

There have been some reports suggesting an association between receiving a COVID vaccine during early pregnancy and an increased risk of miscarriage. However, these reports are based on anecdotal evidence rather than rigorous scientific studies.

In April 2021, a study published in JAMA reported results from over 35k participants who received either Pfizer-BioNTech or Moderna vaccines while pregnant without finding any safety concerns related to adverse birth outcomes including preterm birth or neonatal death compared with unvaccinated controls.

Another study conducted by researchers at Kaiser Permanente Southern California which included more than 6k pregnancies found no increased risk of spontaneous abortion linked to mRNA-based Covid-19 vaccines when administered prior to twenty weeks gestation compared with unvaccinated women matched by age and other characteristics excepting being vaccinated.

Future Research

While the current research is reassuring, more studies are needed to fully understand any potential risks associated with COVID vaccination during pregnancy. The CDC and other organizations continue to monitor vaccine safety in pregnant people through ongoing surveillance systems such as the v-safe registry which collects data on vaccine side effects among pregnant individuals who have received a COVID-19 vaccine.


In conclusion, while there have been some anecdotal reports of miscarriage after receiving a COVID vaccine, recent scientific studies suggest that getting vaccinated against COVID does not pose an increased risk of miscarriage for pregnant individuals. However, further research is needed to confirm these findings and provide additional guidance for those who are pregnant or planning to become pregnant.


1) Centers for Disease Control and Prevention (CDC). (2021). Vaccines & Pregnancy: Frequently Asked Questions. https://www.cdc.gov/coronavirus/2019-ncov/vaccines/recommendations/pregnancy.html

2) Shimabukuro et al., 2021. Preliminary Findings of mRNA Covid-19 Vaccine Safety in Pregnant Persons https://jamanetwork.com/journals/jama/fullarticle/2778234

3) Hause et al., 2021. Association Between mRNA Covid-19 Vaccination and Development of Adverse Obstetric Outcomes https://www.nejm.org/doi/full/10.1056/NEJMoa2104983

*Note: this site does not provide medical opinions or diagnosis and should not be relied upon instead of receiving medical attention from a licensed medical professional.

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1WH staff