Re: Positive OPK and FertilityFriend
The average is within 24-48 hours but some women may have a much shorter window. There was a girl on another forum that only had a positive OPK for 8 hours!!! Your LH surge starts about 3-6 hourse before it hits your blood then urine....
I really suggest the www.peeonastick.com
She has a great OPK section (Q&A). It helped me alot to figure this stuff out!
Mommy to Grace 10/99, Kendall 12/04 and Emily 5/07