mixed signals please help

Zoe
I'm struggling with mixed signals AF is possibly late as this is my first month ttc I had an implant before. 
Ovulation came as planned at the right time! As did spotting ... However now I'm 4 days late with cramping and nausea in the evenings ... not overly sensitive boobies .... but all my tests (last one was 3 days ago) have been BFN EVERY TIME 
My hormones have changed but can't tell why ... it's like I'm on implant again! 
I'm not getting excited I just want an answer ... any tips or advice? 

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