Late implantation? Comments PLEASE!!!!

My cylce is off this month for sure.
​I usually have a 31-33 day cycle but 
​I o'd on cd 23 instead of my usual 19
​Now glow extended my cycle to 36 days 
Temps have never risen in this patterns for me post o nor have ever been this high. I am usually low 98/high 97's at best
​I am experiencing AF cramps today but mostly just terrible back aches today at 13dpo 
BFN's still 
​I did a cm check and it came back a little brown with a little pink hugh on the tampon (my cp is really high so it was the only way to get a sample)
​Could it be late implantation as i had a dip yesterday with really sharp pelvic pains on and off and a .4 rise today? Or is it just AF and my temps are just funky this cylce?
​Help!