5 days late!!

Alright. I stopped taking my BC in February, and we've been trying for baby #3. My period is now 5 days late, but hpt keep showing negative. Should I schedule a blood test?? Or just wait a while longer to see if I get a positive or if my period will start? This is so frustrating!!! I'm hoping my hormone level is just too low for the hpt, and I'm getting false negatives...help!!