Have been having 26-day cycles on and off for most of the last year. Was pretty sure I had been ovulating given temps and other signs. Had been assuming ovulation on or about day 16 but have had blood test this month (on day 19) to check. Period arrived today (day 24 of cycle so 23 day cycle as am now on day 1 of new cycle!!). What is going on? Any ideas? Am getting v panicked. Am 37 and have one dd, who is 2.8.