Freaking out a little

So I am on daily oral monolinyah birth control.

Last Wednesday, I had sex with a condom but some of the semen came out the back and it was everywhere. So Thursday afternoon, I picked up a Plan B pill just to be safe and took it. I have never used Plan B before. My period usually shows up Tuesday or so of the week I take the white pills. It is that week, and it is Wednesday. I have felt slightly crampy like I often do before my period shows up. No blood in sight, however.

I have heard that Plan B can delay your period, but should I be worried about pregnancy at all? What happens if next week rolls around and I start taking my blue birth control pills. Will I still have a period or not?

I’m just super paranoid and nervous! Any help is much appreciated.