Welcome to HCM,
You have taken Emergency contraceptive pill
,hence you must know chances of unexpected vaginal bleeding, but this is not dangerous and should clear up by the time you have your next period.Unwanted 72/i Pill
might also cause your next period to come early or later than normal.
If bleeding is there every time you have intercourse then there could be minor trauma which is another possibility for which you should consult a good Gynecologist He/She will examine and can easily detect any source of bleeding,if it is required a Ultrasonography
may be ordered.
One more thing if you period is delayed by more than 1 week then you should do a urine pregnancy
test and consult Gynecologist.
Take care of your health