Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern.
Emergency contraceptive pill like unwanted 72 work by preventing imlantation of fertilized egg on uterus. It should be taken as early as possible to prevent. It is 95% successful if taken within 24 hours of sex & 70 % successful if taken 24-72 hours.
As per side effects, These pills can cause temporary side effects like
abdominal pain, fatigue, headache, dizziness, breast tenderness, hormonal disturbance & irregular menstrual bleeding, etc
One should never use emergency contraceptive pill as a regular method of
contraception. These should be taken as a emergency contraception method like its name. Regular intake of emergency contraceptive pills can cause serious problems like
irregular periods, ectopic pregnancy, ovarian hyper-stimulation syndrome & even
infertility.
Refer to your gynaecologist
Hope this information helps