Run down

So my peak ovulation day was Wednesday the 15th, so I'm not sure if that means I'm 7DPO or if it goes by when the fertility window drops, which my calendar shows I had 22% Thursday and 11% on Friday. 
Anyway...! 
Kind of tired but think I'm coming down with a cold since I'm developing  a bit of a cough.
Anyone else around the same time as me feeling run down?