As you took your emergency pill soon after the intercourse, you are safe. The bleeding that has appeared is part of a breakthrough that often happens as the pill contains high doses of hormone. For the same reason, you might have missed your period this cycle. You can perform a urine test for pregnancy
and wait for a week if it is negative and if you still do not get your period by then, see your doctor for further evaluation and advice. Do not take emergency pills frequently, they are meant only for real emergencies; take a regular contraceptive
instead. Take care.