All systems go!

Just took my afternoon opk and it looks as about positive as you can get. However, I have always had a positive opk every month, yet my progesterone draw always shows I didn't ovulate, or not as "strong" as I should.

I am on cycle day 14 today, clomid 100mg, and have not had an u/s due to the holiday. Progesterone blood draw will be next friday.

Do you trust opks? If so, when do you bd for the best chances?