Help please !! - ovulation kit.

Li
Quick question. I have the clear blue advance ovulation kit. It has circle flashing happy face and a still happy face. Friday it was a flashing happy face Saturday it was a flashing happy face Sunday it was a flashing happy face so today I was expecting my peak with a still happy face but I just got a circle indicating low fertility :( 
So idk if I Ovulated or not. 
I have normal periods. I have been trying for 6 months and every month I use these and always get peaks but this month I only got high flashing happy face :( 
Has this happened to anyone ? :(