Looks like your hcg is doing its thing 💗
And yeah maybe the test is confused between 2-3 weeks and 3+ weeks but it seems you are pregnant. Sometimes hcg goes up faster or slower it’s a huge range and doesn’t always just double just speaking from my own blood draws
Hcg varies from person to person and pregnancy to pregnancy, as long as it keeps rising its a good sign. Lines on non digital test can take quiet a while for lines to darken as you are still quiet early on.
The test will show 1-2 weeks positive if hcg is over 10 (and yours was 37) so yeah that is expected…