Another negative, 1 week late

Shelby • 21 - 1 child, 1 living in heaven.
Missed my period, would be about 5 weeks in now, since my last period start date. Another negative test, had spotting yesterday... All the same symptoms of last pregnancy, so I am sure I'm pregnant, just not sure if I'm miss carrying or just like the last pregnancy where I had 3 neg HT and a pos blood test... Could this be happening again where the pee tests weren't reading (why it wouldn't when last time I was 6 weeks is beyond me!!) :( so confused..