AF is late, 2 BFN..help!

Co
Okay ladies, I think I'm going to go crazy. AF was due on 2/4 and was a no show. I took a hpt the same day and it was a BFN. I took another one yesterday 2/7, and it was a BFN. Should I just wait a few more days and take another? How long should I wait before I go in for a blood test?