Emergency pill is very effective in preventing conception and as you have taken it soon after the accident, you should be very much protected. Emergency pill can cause breakthrough bleeding
as it interferes with the normal menstrual pattern owing to the high hormone content, but such continuous bleeding is cause for concern. You should get a serum beta-hCG
titre and a trans-vaginal sonogram and consult a specialist for a proper appraisal of the situation. Good luck.