So we managed days 10, 13, 15. Got my opk yesterday (cd16) and BF came home at 3 totally plastered! So annoying. Anyway, my temperature has gone up already this morning so I think I ovulated last night. Looking at my past cycles this seems to happen every time - I ovulate the night that I get my first positive OPK. I don't get any warning - the day before there wasn't even a second line. Does anyone else have the same issue?