Anyone know what this could be? No Period last Month

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I posted 2 places this morning.. didn't know I wasn't suppose to do that. Ive since deleted and only put on here. I sometimes have a difficult time working theses posts.

Anyway... I had No Cycle in July and Last night..

This happened..

Any other thoughts of what this could be?

And if its the Uterine Lining (

as suggested)... why has it happened all of a sudden now & Never before?