Hi, I Took 2 Home Pregnancy Tests 1 About 2

Hi, i took 2 home pregnancy tests 1 about 2 weeks ago in the afternoon came back negitive, and another last tuesday morning came back invalid results. I also had a blood test to see if im pregnant which they said was negitive not even 5 hours afterwards. At this point i am late. My question to you is when should i take another to find out?