First time charting help. How many dpo am I?

Kari
So basically this is my first month charting and I'm using two different apps. It's making me confused. Got peak fertility on Thursday CD 16 with a Clearblue Advanced Test, was traveling so I couldn't take my temp on Friday or Saturday and didn't see a temp shift until Monday morning CD 20. First chart puts me at 3 dpo according to temp shift. Second chart puts me at 6 dpo according to when I got my peak fertility on the CB test.
Which do you think is more accurate?