I am 46. Periods 24 days, sometimes 25. I was 8 days early, no cramps. Last menstral cycle (mc) 10/25 so next mc should have come 11/18, but came on 11/10. I don't sleep around but was with my ex 10/27 , 10/28, no bc. So I thought no ovulation, or ovulated early. That would make those days fertile days if ovulated early? ( If next mc - 14 days = 10/27) Neg test 11/15. Any idea why so early? I am very regular, healthy, multivitamin, exercise daily for >30 years.