Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
No
pregnancy chance after intake of I pill is less & its intake should be able to prevent pregnancy. However, There is no
contraception method in this world which is 100% effective. The bleeding you had must be
breakthrough bleeding & this type of bleeding normally occurs after intake of an
emergency contraceptive pill. Breakthrough bleeding most probably means intake of I pill was succesful in preventing pregnancy.
I pill is an emergency contraceptive pill & it prevents pregnancy by inhibiting
implantation of fertilized egg on the uterus. I pills should be taken as soon as possible after sex.
It is 95% successful if taken within 24 hours of having sex. Success of pills decreases to 70% if taken 24-72 days of having sex. Next time use condom or regular contraceptive pill as method of contraception in future. They have better success rate & have fewer side effects also.
Do a pregnancy test if you miss your next period, to rule-out possibility of pregnancy. If your next period come then you should not worry.
Refer to a gynaecologist
Hope this information helps
Good luck