Ok I normally have a 26-28 day cycle. But this month I got some spotting on CD22 and woke up to what I assumed was my period on CD25 but it was gone by the time I went to bed the same day and nothing since. I do have a rather short period (3 days) and its fairly light. Its been that way since I had my youngest daughter (9 years next month). Has anyone else dealt with this? Or know what it could be?

I couldn't be pregnant, husband had a vasectomy 4 years ago, and confirmed no swimmers after.