Originally Posted by
atomic sagebrush
You MUST NOT start Duphaston until you have ovulated. Telling you to start Duphaston a certain day without even confirming you have ovulated is questionable medical advice. While some people can ovulate despite taking Duphaston, for others it will stop ovulation in its tracks because rising progesterone stops the development of an egg. The doctors who start Duphaston just "whenever" on CD 15 rather than 1-3 days past ovulation like most docs do, are banking on that you are just about to release the egg and so the process can't be stopped, but if they're wrong they can end up stopping O in its tracks.