When will the test show positive?

I'm now 17 days late for my period. I have very regular periods. I normally have one every month. I found out last month that my birth control some how fell out. And my husband and I have had lots of sex. I have taken 3 home pregnancy tests they all say negative. Am I actually pregnant? Or is my cycle really late? I also looked up "phantom pregnancy" wondering if my body is physicing it's self out.