Odd period after miscarriage

I had a miscarriage on 11/27/15. I was told I may have a period in 6-8 weeks. I started a VERY LIGHT spotting on 1/2/16, like so light I didn't think it was anything. It got a little heavier, but nothing major. Yesterday 1/4/16 it got a little heavier, but it's not a normal heavy. It's watery. It's filling tampons but with little blood, and no clots (I always clot) my breasts are still tender and I don't know what is going on. Anyone have any ideas if this is normal after a miscarriage?