I used a fertility test on CD 3 and I was wondering the same thing about when CD 1 was for me since it came at 10pm. The test instructions said that CD 1 was the first day of bleeding whether it started at 6am or 11pm. 12am would have been the next day anyway, so if you bled before 11pm count yesterday as CD 1.
I just re-read your post. You said you were spotting only? I guess it depends how light the spotting was. For me I spotted on a Saturday, then started bleeding at 10pm on Sunday, so I counted Sunday as CD 1.
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