Ovulation and BD'ing...

Still working on getting these opk's right. So I took an opk this morning around 9:30am and got a light positive. I took another tonight, around 9:30pm, and got a dark positive as well as a smiley face on the clear blue digital opk. My question is.. When would the best time to BD be? And when would I most likely be ovulating? Based on my opk results from today.