First time ever taking Plan B, what should I expect?

Hi,

I’m going to try to not make this confusing and make it as short as possible. Three days ago, I had unprotected sex and he finished inside of me. I was supposed to start my sugar pills that day, but I decided to take a regular pill before I went to visit him. The next morning, I kind of freaked out and decided to buy Plan B and I took it. I didn’t take anymore birth control pills afterwards and I guess I’m just wondering if I should expect my period to come this month or what?

Thanks in advanced!