So I've been using Clearblue advanced digital OPKs for the first time this month, and had 5 days of high fertility (flashing smiley). Well, I thought I must have ovulated in that time and just missed my surge, and last night (day 5 of high fertility) I was too tired for sex. Took another OPK today and it was peak, finally!! Was yesterday my best chance for conception?! We are going to DTD today but I'm worried I missed my best chance!