O'ing?

DD
I am on clear blue 2days detection - the one with the smiley face. 
I have been testing every day after fertile week day 1,  twice a day. Yesterday I got a solid smiley morning and evening and we bd. Today afternoon I checked again and it is now solid round- no smiley. I thought it was supposed to be one more smiley or a blinking smiley but it didn't.
Were we too late BDing?
Thanks all!