Brown cm today - thoughts

T
As per glow my period should begin on 4/17. Today as I checked my cm I have brown cm.   Could this just be my period coming early?  Or could it be implantation bleeding?  Too afraid to get hopes up!  
​my bbt had a dip today too. Again don't know if it's period coming early or apart of implantation. Suggestions, thoughts ??  

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