Why is my period late?

I’m currently 12 days late I last started May 10th I had intercourse May 21st and had spotting May 28th I was suppose to start June 12th and had intercourse June 10th but today when I had intercourse again I was spotting I believe it was a very light flow and was light pink I also took three tests three different... show more I’m currently 12 days late I last started May 10th I had intercourse May 21st and had spotting May 28th I was suppose to start June 12th and had intercourse June 10th but today when I had intercourse again I was spotting I believe it was a very light flow and was light pink I also took three tests three different times and was all negative what could be wrong?
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