Condom came off at the end of sex, but it was still hanging outside..should I be worried?

So my fiancé and I were having sex, I was on top and probably waiting a little bit to long to slide off. When I did the comdom came with me. The end was hanging about 1+ inches outside of me and I was able to pull it out no problem. There was still a large amount of cum inside the condom. Should I be worried? I was also at a part of my cycle where Glow says my chances of pregnancy is ~3%. I have heard not so great things about side effects of plan B and am a little leery of taking it. My window for it closes in about 24 hours. Thanks!