As a distinguished figure in the realm of clean beauty and skincare, I can provide some insights on the topic. Rosemary is generally considered safe for topical use, including in shampoos, during pregnancy. However, it is always recommended to consult with your healthcare provider before using any specific products or ingredients during pregnancy, as individual circumstances can vary. They can provide personalized advice based on your medical history and any potential concerns. Additionally, it's worth noting that some people may have sensitivities or allergies to certain ingredients, so it's essential to perform a patch test before using any new product.