Thanks for the query.
You should not take emergency pill frequently.
There should be at-least two months gap between one pill and the other.
Frequent usage of emergency pill can lead to short term and long term side effects.
The intermenstrual bleeding
you are having could be side effect of i pills.
Possibly that can subside soon.
Prefer some regular method of contraception
to avoid these problems in future.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429