Should I be worried?

Hey all. I had a miscarriage back in October and just found out in pregnant! This cycle is super weird and making me nervous because I ovulated 1-2 days after my period ended! I was supposed to ovulate today but I ovulated Dec 5-6🤯🤯 so my question is my FRER are getting darker but my Mommed pregnancy test strips are only getting slightly darker. Should I be worried? I feel like I can’t fully trust first response and was hoping the test strips would be a bit darker by now to kinda help match the FRER. Anyone experience the strips taking forever to darker or should I buy a different brand of test strips?? Thanks!!