What Causes Delayed Periods With Brown Spotting?

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Hi, I was recently about 3.5 weeks late for my period. When I was 2 weeks late I had very mild spotting for about 2 days.. Then nothing.. After 3 weeks inhad thick black spotting for a few days and no blood. I'm very concerned that I am pregnant or that I may have been and then miscarried.. Any ideas? Thanks