I usually have a 28-25 day cycle. In fact I say usually, but I always have a 28 or 35 day cycle. Have conceived two children naturally, now trying for a third.
AF just started today unexpectedly at 26 days. Usually it starts v lightly with a day of spotting but has gone straight into a light-medium bleed. I know that's not a big difference in cycle length but it is unusual. In the two years to took to conceive dd I would have convinced myself it's an implantation bleed and then got upset when it wasn't but I am more realistic than that these days (though I did have bleeding at 5 weeks with dd and was told by EPU that it was a late implantation bleed).
Anyway clearly I am overanalysing and it is just a short cycle and is my af, but any reasons for this or just one of those things?