Frustrated! (Advice Please)

Carolyn
I am so confused idk what to think anymore I have both the P Tracker and glow app the P Tracker says I was due af on 01.24.2016 (10 days late) & my Glow says im due af 01.28.2016 (6 days late) I have no signs of af ive taken hpt test all nothing but a BFN! Only thing I can think of is I ovulated later than shown which is weird because I used clearblue digital opk any thoughts