No period, not pregnant, and breastfeeding?

I have a six month old and my periods returned like clockwork when I was around 10 weeks PP. He is and always has been EBF. I had mid cycle spotting on the 14th-17th of April and my period was due the 23rd so I am now 16 days late. I have taken two tests and both were negative. Any idea what's happening here?

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