Plan B?

I broke up with my boyfriend a few months ago and stopped taking birth control. I had been on it for over 10 years. It only took one month for my period to be regular again. This last week has been awful. My

brother is in the hospital and my ex came back to help me. We’re not together but last night we had unprotected sex. I feel like such an idiot. I just really needed the comfort. He pulled out way before he came. My period should start in 7 days and according to the app I finished ovulating like 6/7 days ago. I’ve been struggling with anxiety for a while now and I’m on medication for it. I read Plan B can make you dizzy which the medicine I’m on already does that. Also I’m under a lot of stress right now so I’m afraid Plan B could make that worse. Of course getting pregnant right now would be the most stressful. Anyone have bad side effects from Plan B?