Is it possible and when should I test?

So I took clomid CD 5-9 and positive OPK on CD 14 at around 5pm, I had sex CD 10 and then CD 16. My bf was sick so we didn't BD very much. My questions are the following...
Pos OPK means 12-36 hours after positive you ovulated correct?
So i ovulated probably CD15?
Is it possible to conceive either of those days?
And when should I test HcG?