Spotting in months after miscarriage

I had a miscarriage on May 18-22, 2015. Since then I have had my first period. However, a few days after the first period I had about 4 days of light spotting. Then back to normal for about 7 days with a positive ovulation test. Then again light spotting for about 4 days again. Has anyone else experienced anything like this? Does this seem normal?