So I don't usually do OPKs in the morning, but went ahead while I'm waiting on the toddler I watch to fall asleep.... This one is definitely positive. These tests get darker up until about 30 mins. My test line is usually considerably lighter than the control when it first starts processing, then gets darker til 10-15 mins when I check it.... This time they were equal darkness from the very first second, so I knew it would be positive. I'm curious to see what my opk looks like this afternoon/evening. My temp was low this morning too, despite a rough nite with DS. I hope this is legitimate. I did have concentrated urine, but I know that won't in itself cause a false positive. I'm trying not to get my hopes up.