Is it possible??

Took a clearblue easy advanced ovulation test last night 8 pm=O.  Then again today at 2 pm=SOLID SMILEY FACE.  Rechecked tonight at 10 pm with a completely newly purchased box of Clearblue easy digital (NOT ADVANCED). and low and behold it was a big fat O.  Is it really possible to have that short of a surge???  My cycle is usually 26-27 days and I am currently CD 12.  Seriously confused:(