Plan B/PMS Symptoms

Me and my boyfriend had unprotected sex for no more than a minute. He peed a few times before so their could not have been precum. I took a plan B anyways, which was 6 days ago. I'm supposed to be getting my period in 4 days, I'm feeling nauseous (I'm guessing that's from the plan B, I called the hotline and they said that this was normal) and I'm having normal PMS cramps that I would feel every month before I get my period. Looking for some reassurance?? What do you guys think? Do you think I'm good??