The lines look good so far, as the other comment said, HCG doubles every 2 days Different brand tests will also give you a different line so if you use a different brand a few days later and it's lighter, just know it could also be from the brand of test
Test again tonight at the same time. It will be more accurate. I never use first morning as it's always more diluted for me.
Its looking great!
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I would test every 48 hours as that's when HCG doubles. However bare in mind that sometimes the lines don't go darker and it's a completely healthy pregnancy but there are so many variables on tests e.g. urine dilution etc that they aren't always accurate x