Ashley - your bump definitely looks bigger. Dont worry about having a miscarriage, since the rate drops significantly at this point in your pregnancy. If you're not gaining weight, does that mean you're losing weight? The baby would weigh something by now and also the extra fluid, so its strange you're not gaining anything.
Afm, I am 4 days late and still not testing again since the only test I have is the digi test. I did some research and it did say that the digi tests are not as sensitive as the regular tests. My hcg level would need to be at least 50 for it to detect pregnancy. I happened to get those tests yesterday at walmart and I saw the one you mentioned Ashley, but I thought the digi test would be more accurate since I hate having to interpret the lines (I have a problem with seeing imaginary lines lol).