You could totally be freaking yourself out too. I know if I have the slightest feeling I might be, then I blow up with overwhelming symptoms. Like last month I had Sore boobs (Like, Ive never had my boobs be THIS sore, I couldn't touch them AT ALL without almost crying), cramps, fatigue, mood swings, etc.. It was the craziest thing ever.
But, there still is the possibility. I would take the test in a few days and see what happens. How long ago was it that you missed the pill?