Have you ever had a light period and ended up pregnant after?

I got a positive test this morning.... I was 20 days late for my period last cycle after TTC. Negative blood test about a week and a half ago, had a light period about 3 days. Then I started testing OPK and they were extremely positive.... so I took a HCG and it’s POSITIVE. Light but DEFINITELY there.... Is it a true positive?!

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