it reminded me of my pregnancy test. my earliest pregnancy test also resulted like this. wait another 3 days, if it's darker, doctor will assume as pregnancy. Mine got really dark when I was 5 weeks pregnant. I could say your pregnancy might be around 3 week or 4 week, so the HCG isn't really much. wait for 1/2 weeks. during that periods, eat healthy food, avoid heavy work, avocado will be the best to keep your early pregnancy.
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Hi please wait for 1 week and try testing again , it may be your hcg level is low , consult a doctor if your period has missed after a week and if still showing faint line.