So I'm so new to this but just wanted to share my experience as I'm sure I'm not the only one. I've been useing OPKs for the first time this month. I followed the instructions waited 5 mins for it to develop in my pee then throw it in the bin. I had convinced myself they weren't peaking and it drove me crazy so I digged one out the bin and I found a peak one for either day 12 or 13. I started using the premom app after this so didnt have a picture of it. I showed my husband and he agrees it's positive. I think they may keep developing so I now stick them in a book and wait a few mins before taking photo on premom. I thought it was a bit gross to keep them but they only go in the bathroom where noone will see. I hope this helps others who are struggling with OPKs. Xxx