Took emergency contraceptive 4 days before fertile days

Hi two weeks ago i stupidly had unprotected sex on my last day of period, he pulled out, but the next day i took ECP for safety, 5 days later i had some brown spotting. Im still scared because my period is supposed to come in 9 days and im feeling nauseous. I dont know if it’s from the stress. Can someone give me some opinions please?