Congrats, you sound pregnant to me! I found the tests I took at the GP were heaps weaker than the HPTs for some reason!

I too wouldn't worry about not putting the lid on or leaving it flat. The lid is just so you don't get wee on the surface you put it on LOL and the flat surface is probably just so the test has the best chance of working.

Congrats again and no cold & flu tablets for you