Hcg and ovulation

Hi I miscarried at 9.5 weeks just over 2 weeks ago I have had a scan that confirmed a complete miscarriage and I’m seeing my fertility specialist tomorrow to talk next steps. In the meantime I don’t want to miss the window I still have some hcg in my system but it’s a vfl

I’ve also had this very positive opk today but could a small amount of hcg be making it look like ovulation? We will get down to it anyway just curious of opinions from people who have been through similar