check this post out, i believe it will answer your question;
http://www.fertilityties.com/post/show/opk-as-a-hpt-myth
http://www.fertilityties.com/post/show/opk-as-a-hpt-myth
Can ovulation predictor test detect hcg at 9dpo????
February 18, 2008
Hi there ladies, I just wondered if there is any truth in that ovulation predictor tests can in fact detect the pregnancy hormone at 9dpo? I know that you should not use them as a pregnancy test but can someone shed some light on this. Thank you.
February 18, 2008