Is I-pill Taken 7 Days After Intercourse Effective?

hi i n my bf had unprotected sex on 14 th feb my periods got over on 6 th feb so i took ipill on 21 feb i got bleeding which lasted for 7 days nw its 24 th march bt still i hav not got my periods should i still wait or should do a pregnancy test pls help me how shoud i count my periods from 21 or my normal date i.e 3...