Confused About Test

brie

OK so I'm currently 7 weeks 4 days. I tested the end of October and had a really strong positive. Tested yesterday with the same brand test and it was a faint positive. Not super faint, it was clear enough for both me and my SO to see right away, but not as dark as last month. Anybody have any idea why? I have my first appointment next week, but am very confused.