Faint FRER line after a one-day period

Has anybody ever got a faint bfp after a one-day period? My period ended two days ago, and I got some random brown spotting today, so I thought that I should take a test. The line is VERY faint, though. I can't really get a pic of it. Do you think I had a chemical, or could I still be pregnant? I got a faint bfp at 10dpo. My short period was 3 days late..

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