Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern.
No pregnancy chance after taking levonelle is very less & intake of I pill post unprotected sex should avoid pregnancy.
Emergency contraceptive pill or Levonelle pill work by preventing
implantation of fertilized egg on uterus. It should be taken as early as possible. It is 95% successful if taken within 24 hours & 70% succesful if taken 24-72 hours of getting pregnant.
As your partner have taken the pill within 72 hours of sex, You should now relax as pregnancy possibility is less. However you should have taken the pill earlier to be more effective.
Now your next period might be delayed. The early bleeding or period you normally face after intake of pill is
breakthrough bleeding, which is common after intake of an emergency pill like levonelle.
Use condom or regular contraceptive pill as method of conception in future. Taking more emergency contraceptive pills can cause problems like
irregular periods, ovarian hyper-stimulation syndrome & even
infertility.
If your periods get delayed by more than 2 weeks, you should do a pregnancy test to rule-out pregnancy possibility.
For more queries consult a gynaecologist
Hope this information helps