What Could Light Bleeding Indicate After Taking IPill And Meprate And When Will Menstruation Resume?

On dec 20 i had protected sex with my partner but i had a doubt so had given her ipill within an hour. on 28,29 dec withdrawal bleeding came but after that period is not coming i had also done her pregnancy test but it came negative. Before sex her last period came on 14 dec. On the 22 to 24 jan, 3 day course of meprate 10mg had been taken and yesterday jan 30 there was some light bleeding what it can be and how long it will take for period?