I am 18 years old, firat year college student still living at home, and had unprotected sex with my boyfriend Right when my period ended. However he "pulled out" waaaay before he cummed, I still took a plan B just in case. About two weeks later, today, I started my period. I read a few things about how stress and that plan b can both make your period irregular but I'm not sure. I had to go to the ER on Monday (July, 14) because of extreme heart pain which caused my left arm to go completely numb, I couldn't even feel it. I was at the hospital for 6 hours before I was sent home with no answers to what was wrong. That was a VERY stressful day, I was never that scared in my life. Could that be a reason? What should I do? Wait it out and see what happens, or should I tell my mother, or tell a doctor?