where's my period?!

I miscarried at 10 weeks on August 5 and finished bleeding about a week later. I did blood work every Tuesday and on 9/20 my levels were low but not negative yet so I had to go another week. I was curious so later that week I took an ovulation test (clearblue advance) and it was high the follow week 9/27 my levels were negative. 2 weeks after my positive ovulation test I still hadn't had a period so I took a pregnancy test, negative.