No, it is not recommended to take a MiraLAX cleanse while pregnant. While the active ingredient in MiraLAX (polyethylene glycol 3350) has been studied and found to be safe for pregnant women in small doses, taking a full-fledged cleanse with large amounts of the medication could have negative effects on both the mother and her unborn baby. Additionally, many doctors advise against using any type of laxative during pregnancy as there are other safer options available. Therefore, if you are considering taking a MiraLAX cleanse while pregnant, it is important to first consult your doctor or healthcare provider beforehand.