Research shows that pregnant women who use marijuana have a 2.3 times greater risk of stillbirth. Animal studies show an increased risk of miscarriage when marijuana is used early in pregnancy, although there is no human research to connect this.
More research is needed on how marijuana use during pregnancy could impact fetal health, but given the potential of marijuana to negatively impact the developing brain, women should refrain from using marijuana while trying to get pregnant, during pregnancy, and while breastfeeding. Some women use marijuana to treat severe nausea during pregnancy; however, there is no research confirming that this is a safe practice, and it is generally not recommended. Women considering using medical marijuana while pregnant should not do so without checking with their health care providers.