Blood test are never wrong so congrats!
Blood will show before urine :) congrats! It's a baby!
Yea a false negative is way more likely then a false positive.
Yup- you're pregnant! Congrats! The blood test is much more sensitive than the hpt, like Cindy said. Some women take weeks for the hpt to indicate pregnancy since it determines the growth hormone and youre still developing that given that you're not even 4 weeks yet.
Blood test can determine pregnancy way before a urine test. Most people don't get a positive on urine test until there missed period unless they take a really sensitive test