Ovary ultrasound

I had a miscarriage 4+3 weeks ago. I went for an internal ultrasound 4 days ago and she said i havent ovulated yet. I understand the follicle ruptures if ovulation has taken place but does the follicle close back up? As in i may have ovulated a lot earlier than i had my scan and it had returned back to normal?

I tried to type this in google and it just wasnt happening.

Its gone 4 weeks and i still havent had my period i have had unprotected sex but im not pinning my hopes as she said i still had little bits of tissue but this nausea and tiredness is insane.

I just wish my period would hurry up.