Pregnancy Scare

Hi everyone. I’m just in a little of a pickle right now and was wondering if anyone could help me..

so I had sex July 5th, became so paranoid that I could become pregnant so I took the plan b pill. I was actually finishing my period that day.

I ended up spotting a couple days later pretty heavy. Lasted about 3-4 days. I have not had any type of sexual intercourse in between the time frame of July 5th to now. My period was supposed to be here on August 25th but ... it’s still a no show. Should I keep waiting? I’m almost positive that I’m not pregnant considering that I didn’t even have an egg to fertilize. I’m also not on any type of BC. Please help.