I feel so stupid. This is the first time I use OPKs. The bottom most test is the one I just took and at start it looked the same as the past few days and typically I would've trashed it and tried with the strip at night like I've been doing but I thought it would be a good idea to see if it's darker than the past ones as today is PD16 and I was expecting the surge. Anyway, I fished the old ones out from the trash and was shocked that the bottom two look positive 😭 I didn't label them so I don't know which days. I usually wait 3 minutes to check and in all days they looked more or less the same as the one I took today. Also, the strips have always been negative and I didn't get EWCM yet as I usually do. Do you think I missed the surge or is it just late? I'm getting the digital ones next time 😞