condom fell off, i took a plan B, will i be okay?

So I’ve never taken a Plan B before (I’m not on birth control, always stick to one partner and always use a condom whenever I have sex), but today was the first time I took one.

The condom fell off at the very end, after we both finished. He pulled out once he had ejaculated in the condom, but the condom was inside of my vagina. However, the base of the condom was hanging outside my vagina — it wasn’t fully inside, only 3/4 of it was.

He paid for my plan B and I took it three hours later. We just wanted to be safe since we weren’t sure if any cum spilled from the condom when he pulled out.

Has this happened to anyone? I feel like it’s pretty common. But i’d love some reassurance since I don’t want to add onto the school stress I already have!