Tests are not quantitative and based on dye levels each brand is different. Also, HCG usually doubles every 48 hours or so, so I wouldn’t expect much of a change in 12. I would relax on the testing for now and you can always see if they’ll get you in for beta draws if you feel like there’s a reason you should need them. I never got betas with my son. I tested at home with cheapies for about a week every couple of days and then stopped otherwise I would’ve driven myself crazy.
Re: Line progression