Should I be nervous? See photo...

I'm super nervous...

I was on Cephalexin for 10 days, finished last Monday. We had sex yesterday and today I noticed I was spotting when I wiped. I'm on the pill and also in the middle of my fertile window. Should I be concerned about pregnancy? I always am stressed when something abnormal like this happens. Please tell me this is nothing and I shouldn't be concerned...

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