Opk after miscarriage

After a miscarriage when should you starting testing for ovulation? I had a d&c at 6 weeks 5 days 11/11 still haven't gotten my period so I'm trying to figure this out! Very impatiently waiting for my period to arrive. I tested last week and got all negatives. I felt like I was ovulating and my line was kinda there and got lighter as I kept testing so I'm think I may have missed my window! Any advice is really appreciated :)