Evening ladies, I've just read that by the time your surge shows up on an OPK that you might have already missed the boat (so to speak) - am v confused now as all OPK packages say that once a surge line shows up that you've got 24-48 hours to BD. Anyone got any info/comments etc? I have to rely on getting the BD at the right time because OH is not able to BD every 2 or 3 days before, around and after OV. Am taking the info I read seriously as it was from Zita West who is a top FS. Thanks for any help you can give x