MD - Obstetrtics & Gynaecology, FCPS, DGO, Diploma of the Faculty of Family Planning (DFFP)
After taking high hormonal emergency pill like I pill one gets withdrawal bleeding 5 to 10 days later, and then new cycle starts. If you did not get withdrawal bleeding as well as missed period then do pregnancy test.
M.B.B.S, Post Graduate Diploma In Maternal & Child Health
Since the pattern has changed, it means there is some problem. You will need some blood tests and usg to rule out certain conditions. You can contact a doctor locally or take advice from me through audio / online consultation.