OK very confused???

well I haven't had a period since November 11 usual symptoms don't know if it af or something else well last night before going to bed I had light pink cm so I thought af will be here in the morning well when I get up nothing when I wide and no af well here recently when going to bathroom I noticed I'm starting to have light brown cm ...any ideas on what's going on ? and I had a blood test done at o.b on Monday and it showed negative but I'm still having all of the symptoms could I have tested to early or is AF getting ready to come????