Help! Natural Plan B Methods?

Helloooo everyone. Last night my fiancé and I were pretty tipsy and ended up having sex (it was the last day of my period, I was only spotting) and I let him cum in me. I am not on birth control. We can't exactly afford Plan B right now, so I was wondering if any of you know of any natural remedies that act as Plan B? Also, what are the chances I may get pregnant? Our wedding is in 5 months, I can't get pregnant 😬