Shorter periods?

Tiffany

I just turned 31, for the last year my periods have been getting shorter and shorter. It’s to the point that I’m only bleeding lightly for a day or two. I went to the doctor and they checked my hormone levels, they say everything is normal.

Is this a sign of early onset menopause? Are my eggs just low quality? Any insight would be appreciated.

Side note: I have pcos and lupus. These may be contributing factors.