It is not normal to have black residue of chenoprogesterone. Under normal circumstances, the residue of chenoprogesterone is white, and the drug is used to supplement progesterone, which is a progesterone drug, and the drug can maintain the luteal function when doing IVF. The black residue after the use of medication is considered to be caused by vaginal bleeding, which may be caused by gynecological infection. If you have gynecological inflammation, you need to treat it with anti-inflammatory drugs in time. You must be careful with anti-inflammatory drugs after in vitro transplantation, so as not to use them improperly and affect the development of the baby, if the vaginal damage does not affect much, it can recover on its own in 1-2 days.