BLEEDING NOT START AFTER TAKEN UNWANTED.

If you are talking about unwanted tablet that is used as an emergency contraception after unprotected intercourse, then this tablet should have been taken within 72 hours to be effective. If she does not get her period even until one week after expected date of period then visit the hospital to rule out a pregnancy. If you are talking about unwanted tablets to get rid of a pregnancy, these tablets should only be taken under the supervision of a gynaecologist. If she has already taken and is still not bleeding, it might be a tubal pregnancy which is very risky for her life or an incomplete abortion needing higher doses or surgical procedure to evacuate the uterus. But both the scenarios should be treated under a gynaecologists care. So visit the hospital for further treatment at the earliest.