General any herbs which cause contractions during pregnancy need to be used with caution if they are used at all. Cathartic herbs such as cascara, senna, cape aloe etc fall into that category. Dr Shulze always said that it was safe to use his IF#1 during pregnancy, but not in huge amounts. But then, common sense, if you are having problems, it might not be a good idea. Psyllium husks or ground psyllium seeds and flax seed can be used to help whisk toxins out of the bowel. Kelp powder and the green drink are also good. Cramp bark can also be used and helps if the fetus is not properly positioned in the uterus as well as for cramping and premature contractions.