I Had Unprotected Sex But Took An Emergency Contraceptive (this

I had unprotected sex but took an emergency contraceptive (this is my second time taking one) and then got my period shortly after (around the time it was due) I had insane cramps before my period which is normal for me my period was very light am I had some brown coloration in it and lasted 3 days it is usually very heavy and lasts 5 or more is there a high possibility I am pregnant?