Hi Carys

Some people get faint second lines on the opk's for up to a week before they O and for a week after.Its just the LH surge starting and leaving.I personally only ever detected a LH surge just before O(6-24 hours) and then never got a faint second line after I O.

My doc said to me to BD from day 9 of my cycle onwards, just so I catch the eggie!

Goodluck................................