Opks help please!

Mary β€’ First baby {BOY} due Sept 15, 2015 πŸ’™πŸ’™πŸ’™ Over the moon with J O Y
Ok I posted Monday and now I'm even more confused with these opks. I thought it was cd 9 am that was positive now I'm think cd 11 am is more positive, I guess we should just bd every other day just in case? Help lol!