As you will be aware most women tend to get constipated during pregnancy, which may worsen as the pregnancy advances. Soap and water enema is helpful and does no harm to the colon. However there are mild laxatives that can be used as suppositories which are to be inserted in the back passage to facilitate bowel movement and in my opinion are better and easier alternatives. I suggest you consult your doctor for a laxative suppository suitable for yourself, as you may find it difficult to self administer enemas as your pregnancy advances.