What Is Use Of Taking Endogest In Infertility Treatment?

hello, sir

i'm 28 yr. old & taking infertility treat. from last month, this mth. doctor make sonography from 11 th day to 16 th day on daily basis , on 13 th day dr. give chorionic gonadotrophin inj-5000 iu,
& on 16 th day dr. prescibe endogest-200 mg (for vargainal) . so plz guide me my treatment is going inproper way & roll of endogest-200.
thanks