Optimism to pessimism

Every month during my fertile window I get optimistic that "this is the month!" But after the fertile window ends I start to think I'm probably not pregnant so why get my hopes up. Maybe it's my defense mechanism after so many bfns? This is the last day of my fertile window and I'm already pretty sure I'm not pregnant, even though we did everything right. 
Does anyone else feel like this? 

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