Quercetin is generally considered safe for most pregnant women, however it is always best to check with your doctor before taking any supplements while pregnant. Quercetin has been found in some studies to be beneficial during pregnancy and can help reduce inflammation, support the immune system, and even improve fertility. However, high doses of quercetin have not been studied extensively in pregnant women and so caution should still be taken when consuming this supplement. It's also important to note that if you are breastfeeding or trying to become pregnant, it may be advisable to avoid quercetin altogether as its effects on these groups are not yet known.