Suggest Treatment For Delayed Mensturation

hi there...m 35 years old and had a son 7 months ago through c sec...my LMPwere on 19 jan...i did pregnancy test butbit was negative..my doc had given me medicine but i vomited it out...they were 2 capsules...unfortunately i forgot the name and lost the dr s prescription...could u please tell me about some medicine to have my periods. p.s i do not feed my baby...