Pregnancy scare?

Hi, so I just had my period a couple of days ago and it ended at 7 days as normal, and right before I had gotten my period me and my fiancé did the woohoo with no protection, he did not finish in me and I took plan b right away after so I was relieved when I got my period, but a couple days ago I threw up which I never do it is not normal for me, and I’ve been feeling not so great but I’ve realized that I’ve been hungrier than usual and I’m not sure if I’m just over thinking or whatnot but I just need to know if it’s possible to be pregnant in this situation.
Pregnancy scare?
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