af due 11/10 cd16 and haven't ovulated yet

Carina
I started taking OPKs on the 26th but still no smiley face on my clearblue tests. Is it possible I missed my surge? Or will I be ovulating soon? The lines on the test stick seem to be getting darker but I know you can't go by that because you have to get a smiley face and last month I ovulated on CD13 so I'm Getting a little stressed about it.