Due to the lack of research and safety testing, it is not recommended to use Latisse when pregnant. The active ingredient in Latisse, bimatoprost, has not been studied for its effects on a developing fetus. Studies have shown that using similar medications during pregnancy can cause birth defects and eye problems in babies. In addition, there may be an increased risk of miscarriage or other complications due to hormone changes during pregnancy. For these reasons, it is best to avoid using Latisse while pregnant or nursing until more information is available.