testing hcg levels on cheap preggo tests from internet - currently 7 weeks

Hello, I am one of those crazy worry warts! Is it possible to test how strong your hcg levels are on a cheapy preggo test? As you can see in the pic, oldest starts from the top with then most recent at the bottom. I noticed the test line on prior darker (left line is the test line btw). Does this mean my hcg levels are dropping? Btw I am 7 weeks today.