Normal?

Erica
Is it normal to have realllllyyy light periods..?
I mostly spot for my "period"
It goes from pink to a brown and pretty much just clumpy. 
I haven't filled a tampon in months and for me, that's really abnormal. 
I'm on metformin twice a day. 
Not to mention my cycle is only about 22-25 days..
Also veryyyy abnormal for me..