Pregnancy scare

Okay so my average cycle is 28 days long and I had a condom mishap on day 15 of my cycle which according to my research was supposedly day 2 of my fertility window I took plan B within an hour and half of the accident and I’ve felt pretty normal aside from the last two nights I’ve felt nauseous and have had either mild cramps or a sharp shooting pain in stomach. Today I have also been mildly cramping. I’m expecting my period in 2 days! Any opinions on to if I’m pregnant or not?