Meprate usewhile planning for pregnancy.

Earlier i was taking krimson 35 to have periods and then i stopped it and took meprate instead to get periods.as advised earlier in a health checkup by a gynaec doctor. Currently i am taking meprate 5 days a month(15 to 20 every month),then i will get my periods after 5 to 7 days(28 to 1st-period dates) My doubt is if we plan to get pregnant,then when should i take meprate n how... If i stop taking it now completely then automatically i wont get periods,so how can i try to get pregnant if there are no periods as we should try for pregnancy after periods. And suppose i took the medicine n after my period stops we tried for pregnancy then in next month should i take meprate?If no then if i am not pregnant then how i will start taking meprate again. Please could you clarify my question how to plan for pregnancy if i m depending on meprate or should i stop it then how i will get my periods. Thanks in Advance.