should I go get a blood test

should I go get a blood test

So I'm now 7 days late on my period and have takin tests every morning still saying negitave. I found out with my first at 5 weeks. Do u think I should wait on more week to test or so u think a blood test would let me now sooner. Has anyone has a blood prego test be for how does it work is it based off same hormone and a home test?? Need options