So my cycles are always irregular- but last 3 cycles (all on clomid) looked like this- 31 days, 39 days, 31 days. This month I did not take Clomid and used the Clearblue Advanced Digital OPK and it showed low fertility for days 9-13, high fertility on Day 14 and Peak fertility on Day 15. I am now on day 39 of my cycle still with no period. I took a test this morning and it was negative. How could I ovulate on day15 of my cycle and almost 25 days still not have a period since I'm not pregnant?