For many years (10+) I have had short cycles, with a few exceptions they've been 25 days bang on the nose every cycle. This month it was 23 days, now I am nearly 41 I am concerned this could be a sign of perimenopause. We have been ttc number two for a couple of years now (fertility issues, miscarriages etc) and am now concerned that my body is starting to gear down but am probably oversensitive as ttc has been very difficult. Can this just be a one off? I have been so regular for so long (even when breastfeeding) that it is easy to assume the worst.