Between May and July my period went from a 4 week cycle to a 3 week cycle, then my last period came a week and a half after I finished my previous period. I am 44, I thought I might be starting menopause but my doctor check my hormone levels which appear to be normal, but I now have anemia (likely due to the frequent periods). My periods last about 7 days (the last 3 days are pretty light). My doctor has requested a pelvic ultrasound, what is she looking for?