I used OPKs twice a day for 6 days, all very negative until CD18 when I got a dark but not positive test in the morning (as well as a sharp temp dip), then at about 6 PM I got a positive. Morning of CD19, my temp had shot up and I was back to very negative OPKs. Temperatures have stayed up since so I know I ovulated, but I’m confused because that would have put ovulation in between 6PM and 5AM. Is that possible? I thought you O’d at least 12 hours after that first positive