It was not possible to inform the physician before the colonoscopy that you are pregnant, because you did not know. A colonoscopy and associated medications should not harm an embryo in any way. You were probably only given a pain reliever and a sedative intravenously (in your vein) to relax you, and may have been asked to flush your bowels with a bowel preparation kit. To be sure, you can contact the physician's office who performed the colonoscopy and ask exactly what their procedure is, what medications you took, and the possible effects on developing fetus.