Hello Well come to health care magic Dear patient, as the pregnancy advances the growing uterus compresses the rectum and can cause constipation, so nothing to worry about it , how ever if it is too severe, then you should consult your gynecologist who will give you some stool softner or lexative that will releive your problem , more over this can be helped by taking high fiber diets, good fluid intake, by moving around and not lying on the bed round the clock and preferably try to lye down in lateral position than in supine position, wish you good luck thanks Dr Arshad