In the kindest possible way, I’m going to tell you to step away from the tests. In my experience they mean nothing! Like you I’ve had 4 mc in a row.
I can only give you my own experiences. I was still getting positives A MONTH after medical management for missed miscarriage, they were still fairly strong after 2 weeks.
The CB didgital went up perfectly from 1-2, 2-3, 3+, then I only found out at early 8 week scan that I had t progressed past 6 weeks.
Faint lines can be dependent on ANYTHING and WILL be different depending which time of day you are testing or how much liquid you have had, even if testing fmu.
The ONLY way to really know what is going on is to go for a scan as soon as you can. Please step away from the tests, they stress you out and don’t give you proper information. They only confirm hcg in your system.
Under ‘normal’ circinstances that’s fine, but for us that suffer rmc - it really doesn’t confirm that anything concreate will develop.
This preg I only tested once on a boots cheap one at 5 weeks, and called EPAU. It’s a stresssful, and horrid time. I know. But after doing what you currently are, I finally realised that agonising over lines is a waste of time!