Out of wack

A
I'm going on 5 days late on my period, but no positive pregnancy tests. Actually, I've had four negative. I had a miscarriage back in March and my period restarted in April, so I'm not sure if my body is readjusting or whatever. I also had an ectopic Sept of last year and my period went pretty much back to normal. Has anyone had this issue? 
[EDIT]: With both pregnancies I lost, I didn't get an immediate positive. However, it did show at least 2-3 days after I missed my period.