Thanks for posting on HCM,
It is not advised to take emergency pills repeated, instead, you should take oral contraceptives if you intend having unprotected sex and have no desire for pregnancy
. Most emergency pills are made of hormones (synthetic) and come with their own side effects especially when taken repeatedly.
What you will need to do now, in order to try to normalize your hormones, is to see a gynobs for complete evaluation. The gynobs after establishing the cause, will provide you with medications to stop the bleeding and cause your cycle to become normal. You are also advised not to continue with emergency pills, as you risk other complications with your pelvis.
Hope this helps