Temp Chart and TMI s/s

Stefanie • TTC# 2
So this is confusing, charting my temp and I had no real dip. I'm 9dpo with brown spotting & slight cramps. I'm wondering if AF is coming early, I thought my temp would change? Hmm? I guess I don't understand this whole temp thing yet!  
Merry Christmas everyone~ Maybe on to another cycle:-(