Clearblue ovulation charting help

Ashley • 31 yrs old, RN. Wife of 10 years, mommy to our sweet 9 yr old & baby girl born 9-11-16!
Hey ladies!  So, because clear blue shows the peak face for 2 days do you chart peak for both days or just for the first day it appears?  It shifts your window if you do both days so I'm not sure what to do.  
I also went from low to peak. Took me by surprise bc I always get high days then peak but this time I didn't.  So I had an extra kit left over and used it last night and got low.  This morning I got peak.  So I guess I am definitely in peak.  I'm on metformin & Femara for fertility.  Thanks for input!