Menthol and eucalyptus oil aren't known to be harmful to use when planning or during pregnancy. In fact, lots of customers use (or have used) the patches throughout pregnancy - having been cleared by their doctor / pharmacist to use them - particularly in their first trimester.

However, as with all herbal products, we always advise consulting your doctor first as we do know that some doctors advise against the use of any essential oils whatsoever - either when planning a pregnancy, or while during pregnancy. We just always prefer to be on the safe side, and it's also nice for you to have peace of mind if you speak to a doctor / pharmacist you trust.