Ovulated Late

glow originally put that I would be having a fertile window the beginning week of this month. I did an opk and it was negative that entire week, we still bd just to be sure. had not gotten a peak till today! We bd last night though, should we bd again today? Or just wait for tomorrow? could I miss my window? Any advice helps as it is my very first time tracking with opk and unsure of what to do.