Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
Mild vaginal bleeding post intake of an
emergency contraceptive pill like Unwanted 72 is not a problem & has no relation with getting pregnancy. The bleeding she had must be
breakthrough bleeding which normally occurs within 3 weeks of intake of this pill. You should not be much concerned about it.
This bleeding is different from her period & is normal feature of intake of emergency contraceptive pill & means that intake of Unwanted 72 was successful in preventing pregnancy. This bleeding is due to high dose of
levonorgestrel in the pill, which disrupts your normal menstrual cycle & cause this type of bleeding.
Don't take Unwanted-72 pill too frequently. These pill can cause
irregular periods & other serious side effects. Use condom or regular contraceptive pill regularly as method of
contraception in future. These have less side effects & are more effective in preventing pregnancy.
Refer to a gynaecologist for more queries
Don't worry you would be fine
Hope this information helps