I have always had very regular periods, the only time I was late was when I got pregnant with my son, but now I'm 5 days late. My SO and I were last intimate early August, I started my period on the 5th of August. I should have started sep 2 and I am now 5 days late. I have taken 2 hpt and both were neg. Is it too early to tell, or should I have a blood test done? I have an appointment with pain management for injections in my back withinI have always had very regular periods, but now I'm 5 days late. My SO and I were last intimate early August, I started my period on the 5th of August. I should have started sep 2 and I am now 5 days late. I have taken 2 hpt and both were neg. Is it too early to tell, or should I have a blood test done? I have an appointment with pain management for injections in my back with xray in 4 days. I'm worried if I am pregnant that I shouldn't have them done.