Morning blank and then evening solid smiley - so confused?

Hello,
I have a 30 day cycle and this is my second month using clearblue. Last month I used the Clearblue Digital Sticks and got a smiley on Day 13 and 14. This month I decided to try the Advanced version - today is day 13 and I got a blank circle this morning but I tested this evening after over 6 hours without peeing and I got a solid happy face - never a flashing smiley.
Does this mean I am ovulating or is it a false positive.
Why have I not gotten a flashing smiley? Help I am so confused