intermenstrual       
adjective [ before noun ] (also inter-menstrual) uk/ˌɪn.təˈmen.strʊəl/ us/ˌɪn.t̬ɚˈmen.strəl/
 经间期的
between the times every month when blood normally flows from a woman's uterus (= the part of the body in which a baby grows)
  The woman had experienced intermenstrual bleeding. 这位女士有经间期出血病史。 
 The doctors adminstered the drug during the intermenstrual period. 医生在经期间开了这种药。 
  - More examples
 - It can sometimes be difficult to differentiate inter-menstrual bleeding from irregularly frequent periods.
 - The incidence of intermenstrual bleeding during treatment decreased rapidly after the first cycle.
 - Endometritis should be considered as a possibility in all young women who have intermenstrual bleeding.