Kel, I've always assumed 24 hours after the darkest OPK.

Emma, FX the time passes quickly.

Afm, I'm starting to worry about this trend of shorter cycles. I've had a 32 day cycle my entire life and suddenly I'm getting 30, 29, 28 and now 27 days. I desperately hope it's just because of the medicated cycles we've done recently, but I'm worried it's the beginning of the end...