OPK help...please!!

I miscarried on the 7th, got my levels checked and everything was back to pre-pregnancy. So we didn’t waste any time and started TTC right away. I started using OPKs Dec 13th and the test line looked pretty dark and that I would probably ovulate in the next few days. But now every day the line has been getting more faint instead of darker. Is it possible I ovulated right after miscarrying? And that when I tested on the 13th, I was actually catching the end of my ovulation. not my almost peek of ovulation? I would assume if all my levels were back to zero that my OPKs wouldn’t be affected by my previous pregnancy. I could really use some help right now.

I’ll keep testing every day. I just wanna know if it’s possible I ovulated right after miscarrying? Between the 7th and 13th when I wasn’t testing since I stopped bleeding on the 10th. OR did I possibly miss my surge since I was only testing once a day? Dec 13 looked like I was ALMOST ovulating then the 14th was noticeably darker but still not 100% positive, then the 15th and today the line is fading away.