5 weeks post miscarriage, finally negative hpt

It’s been 5 weeks since my MC.. I’m referring to my first day of bleeding as CD 1 so now, I’d be at CD 35 and no AF in sight. I finally got my first negative hpt 4 days ago and what seems to be all positive opks since? (My first time using these) Are these accurate? Could I be ovulating and able to conceive this many weeks past my miscarriage? I see post after post of conceiving 2 weeks after miscarriage so I thought I had missed my window! Any advice, personal experience and stories are appreciated!!!