So I am trying to get a feel for what is normal. My cycles are generally between 28-31 days.. most commonly 28-29 days. Last month was my first month using an OPK. I used the clear blue advanced digital. On CD 14 I got a flashing smiley. In CD 15 I got a solid smiley. According to my BBT, I ovulated on CD 15. This all seemed normal to me and right in tune with the length of my cycles. This month.. I am on CD 16 and have still yet to even see a flashing smiley. Temps are still low. Do you think I might just be having a late month? Does ovulation jump around like that on different months? Any advice is much appreciated. Thanks!