Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
Delay in periods is a common side-effect after intake of an
emergency contraceptive pill like Unwanted 72. The delayed periods are due to effect of high dose of
levonorgestrel hormone in Unwanted 72 pill which disrupts your normal
menstruation & causes delayed periods. Your periods may be delayed for 1-2 cycles.
An emergency contraceptive pill like unwanted 72 prevents pregnancy by inhibiting implantation of fertilized egg on to uterus. It is 70% succesful if taken 48 to 72 hours of intercourse. As you had taken the emergency contraceptive pill within 64 hours of sexual intercourse, pregnancy possibility should be less but possible.
An emergency contraceptive should not be used as regular method of
contraception. Regular intake of emergency contraceptive pill could cause irregular & delayed periods,
ovarian hyperstimulation syndrome, ectopic pregnancy & other harmful effects including infertility. Next time use regular contraceptive pill or condoms for prevention of unwanted pregnancy.
You are also advised a pregnancy test if you miss your next period
Don't worry you would be fine
Hope this information helps