First time OPK negative to peak?

Stephanie

This is my first cycle using OPK. Using the clear blue digital, I had a negative yesterday afternoon around 2. This morning at 10 am I got a solid smiley which it says means peak.

Wondering if it’s normal to skip the blinking smile. Obviously I’ll BD tonight but wondering if I missed the general fertile window and is tonight our only real shot? Better to BD tonight and tomorrow or tonight and then Saturday?